Caculate capacity in the default constructor of InternalThreadLocalMap

[kingkh1995]

What is the purpose of the change

avoid foreseeable expanding in InternalThreadLocalMap

Brief changelog

use the same code which in method expandIndexedVariableTableAndSet to caculate capacity when create a InternalThreadLocalMap instance

Verifying this change

[codecov-commenter]

Codecov Report

Merging #8697 (4e6b806) into 3.0 (d545d53) will decrease coverage by 0.07%.
The diff coverage is 90.90%.

@@             Coverage Diff              @@
##                3.0    #8697      +/-   ##
============================================
- Coverage     63.78%   63.70%   -0.08%     
  Complexity      314      314              
============================================
  Files          1142     1142              
  Lines         48077    48080       +3     
  Branches       7248     7249       +1     
============================================
- Hits          30664    30631      -33     
- Misses        14049    14077      +28     
- Partials       3364     3372       +8     

Impacted Files	Coverage Δ
...bbo/common/threadlocal/InternalThreadLocalMap.java	74.02% <90.90%> (-15.17%)	⬇️
.../remoting/transport/netty4/NettyServerHandler.java	62.79% <0.00%> (-9.31%)	⬇️
...va/org/apache/dubbo/common/utils/ExecutorUtil.java	62.06% <0.00%> (-3.45%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	76.64% <0.00%> (-3.29%)	⬇️
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	68.46% <0.00%> (-2.71%)	⬇️
.../threadpool/manager/DefaultExecutorRepository.java	71.33% <0.00%> (-2.00%)	⬇️
...a/org/apache/dubbo/monitor/dubbo/DubboMonitor.java	86.66% <0.00%> (-1.91%)	⬇️
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0.00%> (-1.89%)	⬇️
.../src/main/java/org/apache/dubbo/rpc/RpcStatus.java	70.23% <0.00%> (-1.20%)	⬇️
... and 7 more

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