Separate Sink, Source & CloseableChannel interfaces

[adamw]

Closes #11

[github-actions]

Benchmark results

Java:
(capacity)  (chainLength)  Mode  Cnt     Score    Error  Units
BufferedBenchmark.arrayBlockingQueue             1            N/A  avgt    5  1035.919 ± 74.658  ns/op
BufferedBenchmark.arrayBlockingQueue            10            N/A  avgt    5   179.955 ± 48.918  ns/op
BufferedBenchmark.arrayBlockingQueue           100            N/A  avgt    5   114.026 ±  3.927  ns/op
BufferedBenchmark.channel                        1            N/A  avgt    5   201.463 ± 57.116  ns/op
BufferedBenchmark.channel                       10            N/A  avgt    5   185.132 ± 40.618  ns/op
BufferedBenchmark.channel                      100            N/A  avgt    5   156.564 ± 32.471  ns/op
ChainedBenchmark.channelChain                    0            100  avgt    5  1015.517 ±  7.093  ns/op
ChainedBenchmark.channelChain                    0           1000  avgt    5  1017.394 ± 25.045  ns/op
ChainedBenchmark.channelChain                    0          10000  avgt    5  1024.424 ± 22.666  ns/op
ChainedBenchmark.channelChain                  100            100  avgt    5    30.934 ±  0.504  ns/op
ChainedBenchmark.channelChain                  100           1000  avgt    5    30.089 ±  1.029  ns/op
ChainedBenchmark.channelChain                  100          10000  avgt    5    32.276 ±  2.031  ns/op
ChainedBenchmark.queueChain                      0            100  avgt    5   130.703 ± 24.590  ns/op
ChainedBenchmark.queueChain                      0           1000  avgt    5   134.679 ± 22.130  ns/op
ChainedBenchmark.queueChain                      0          10000  avgt    5   131.210 ±  6.941  ns/op
ChainedBenchmark.queueChain                    100            100  avgt    5    11.152 ±  0.316  ns/op
ChainedBenchmark.queueChain                    100           1000  avgt    5    10.923 ±  0.547  ns/op
ChainedBenchmark.queueChain                    100          10000  avgt    5     9.365 ±  0.344  ns/op
RendezvousBenchmark.channel                    N/A            N/A  avgt    5   178.396 ± 39.509  ns/op
RendezvousBenchmark.exchanger                  N/A            N/A  avgt    5    94.380 ± 10.225  ns/op
RendezvousBenchmark.synchronousQueue           N/A            N/A  avgt    5   616.833 ± 17.666  ns/op
SelectBenchmark.selectWithSingleClause         N/A            N/A  avgt    5   225.474 ± 26.958  ns/op
SelectBenchmark.selectWithTwoClauses           N/A            N/A  avgt    5   213.507 ± 14.808  ns/op

Kotlin:
(capacity)  (chainLength)  Mode  Cnt    Score    Error  Units
BufferedKotlinBenchmark.channel_defaultDispatcher                        1            N/A  avgt    5  120.901 ±  0.753  ns/op
BufferedKotlinBenchmark.channel_defaultDispatcher                       10            N/A  avgt    5   54.168 ±  0.653  ns/op
BufferedKotlinBenchmark.channel_defaultDispatcher                      100            N/A  avgt    5   31.581 ±  4.569  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                    0            100  avgt    5   70.248 ±  3.209  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                    0           1000  avgt    5   64.599 ±  3.027  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                    0          10000  avgt    5   60.507 ±  2.063  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                  100            100  avgt    5   13.745 ±  0.399  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                  100           1000  avgt    5   13.106 ±  0.437  ns/op
ChainedKotlinBenchmark.channelChain_defaultDispatcher                  100          10000  avgt    5   15.156 ±  0.951  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                            0            100  avgt    5  102.830 ±  8.335  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                            0           1000  avgt    5  142.288 ± 17.504  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                            0          10000  avgt    5   95.203 ±  4.529  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                          100            100  avgt    5   29.820 ±  1.205  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                          100           1000  avgt    5   28.879 ±  0.387  ns/op
ChainedKotlinBenchmark.channelChain_eventLoop                          100          10000  avgt    5   30.777 ±  0.449  ns/op
RendezvousKotlinBenchmark.channel_defaultDispatcher                    N/A            N/A  avgt    5  142.669 ±  3.832  ns/op
SelectKotlinBenchmark.selectWithSingleClause_defaultDispatcher         N/A            N/A  avgt    5  256.774 ±  0.811  ns/op
SelectKotlinBenchmark.selectWithTwoClauses_defaultDispatcher           N/A            N/A  avgt    5  323.104 ±  1.998  ns/op