Add more documentation for flake8-type-checking

[tjkuson]

Add documentation to the flake8-type-checking rules that check for runtime imports inside type-checking blocks and empty type-checking blocks.

Builds on #3886 to complete the flake8-type-checking ruleset.

Related to #2646.

[github-actions]

PR Check Results

Ecosystem

✅ ecosystem check detected no changes.

Benchmark

Linux

group                                      main                                   pr
-----                                      ----                                   --
linter/all-rules/large/dataset.py          1.02     19.4±0.56ms     2.1 MB/sec    1.00     18.9±0.67ms     2.2 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.04      4.7±0.45ms     3.5 MB/sec    1.00      4.5±0.13ms     3.7 MB/sec
linter/all-rules/numpy/globals.py          1.01   615.3±26.03µs     4.8 MB/sec    1.00   606.8±22.00µs     4.9 MB/sec
linter/all-rules/pydantic/types.py         1.03      8.3±0.24ms     3.1 MB/sec    1.00      8.0±0.25ms     3.2 MB/sec
linter/default-rules/large/dataset.py      1.05      9.7±0.40ms     4.2 MB/sec    1.00      9.2±0.37ms     4.4 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.04      2.1±0.08ms     7.8 MB/sec    1.00      2.1±0.08ms     8.1 MB/sec
linter/default-rules/numpy/globals.py      1.00    245.6±8.04µs    12.0 MB/sec    1.08   264.7±20.83µs    11.1 MB/sec
linter/default-rules/pydantic/types.py     1.00      4.5±0.15ms     5.7 MB/sec    1.01      4.5±0.15ms     5.6 MB/sec

Windows

group                                      main                                   pr
-----                                      ----                                   --
linter/all-rules/large/dataset.py          1.03     16.3±0.61ms     2.5 MB/sec    1.00     15.8±0.11ms     2.6 MB/sec
linter/all-rules/numpy/ctypeslib.py        1.02      4.1±0.06ms     4.0 MB/sec    1.00      4.1±0.06ms     4.1 MB/sec
linter/all-rules/numpy/globals.py          1.00    488.5±5.40µs     6.0 MB/sec    1.00    489.6±6.81µs     6.0 MB/sec
linter/all-rules/pydantic/types.py         1.00      6.7±0.05ms     3.8 MB/sec    1.00      6.7±0.06ms     3.8 MB/sec
linter/default-rules/large/dataset.py      1.00      8.0±0.09ms     5.1 MB/sec    1.00      7.9±0.04ms     5.1 MB/sec
linter/default-rules/numpy/ctypeslib.py    1.00  1735.1±21.36µs     9.6 MB/sec    1.01  1748.5±19.17µs     9.5 MB/sec
linter/default-rules/numpy/globals.py      1.00    189.2±3.41µs    15.6 MB/sec    1.01    192.0±5.37µs    15.4 MB/sec
linter/default-rules/pydantic/types.py     1.00      3.6±0.03ms     7.1 MB/sec    1.01      3.6±0.04ms     7.0 MB/sec

[charliermarsh]

Thanks! Looks great.