make output file size precision configurable

[jameslamb]

Closes #297

Makes the precision of file sizes appearing in output from --inspect and in log messages / errors configurable.

For example:

mkdir -p ./delete-me
pip download \
  --no-deps \
  -d ./delete-me \
  'pandas>2.0'

Default behavior:

pydistcheck \
    --inspect \
    --max-allowed-size-compressed '500K' \
    ./delete-me/pandas*.whl

==================== running pydistcheck ====================

checking './delete-me/pandas-2.2.3-cp312-cp312-macosx_11_0_arm64.whl'
----- package inspection summary -----
file size
  * compressed size: 10.837M
  * uncompressed size: 38.545M
  * compression space saving: 71.9%
contents
  * directories: 154
  * files: 1509 (44 compiled)
size by extension
  * .py - 19.428M (50.4%)
  * .so - 18.699M (48.5%)
  * no-extension - 0.285M (0.7%)
  * .pyi - 0.101M (0.3%)
  * .toml - 23.883K (0.1%)
  * .tpl - 8.287K (0.0%)
  * .txt - 69.0B (0.0%)
largest files
  * (1.923M) pandas/_libs/groupby.cpython-312-darwin.so
  * (1.78M) pandas/_libs/hashtable.cpython-312-darwin.so
  * (1.626M) pandas/_libs/algos.cpython-312-darwin.so
  * (1.106M) pandas/_libs/interval.cpython-312-darwin.so
  * (1.015M) pandas/_libs/join.cpython-312-darwin.so
------------ check results -----------
1. [distro-too-large-compressed] Compressed size 10.837M is larger than the allowed size (0.488M).
errors found while checking: 1

==================== done running pydistcheck ===============

Configurable output size:

pydistcheck \
    --inspect \
    --max-allowed-size-compressed '500K' \
    --output-file-size-precision 5 \
    ./delete-me/pandas*.whl

==================== running pydistcheck ====================

checking './delete-me/pandas-2.2.3-cp312-cp312-macosx_11_0_arm64.whl'
----- package inspection summary -----
file size
  * compressed size: 10.83705M
  * uncompressed size: 38.54525M
  * compression space saving: 71.9%
contents
  * directories: 154
  * files: 1509 (44 compiled)
size by extension
  * .py - 19.42828M (50.4%)
  * .so - 18.69949M (48.5%)
  * no-extension - 0.28504M (0.7%)
  * .pyi - 0.10095M (0.3%)
  * .toml - 23.88281K (0.1%)
  * .tpl - 8.28711K (0.0%)
  * .txt - 69.0B (0.0%)
largest files
  * (1.92252M) pandas/_libs/groupby.cpython-312-darwin.so
  * (1.77986M) pandas/_libs/hashtable.cpython-312-darwin.so
  * (1.62634M) pandas/_libs/algos.cpython-312-darwin.so
  * (1.10629M) pandas/_libs/interval.cpython-312-darwin.so
  * (1.01499M) pandas/_libs/join.cpython-312-darwin.so
------------ check results -----------
1. [distro-too-large-compressed] Compressed size 10.83705M is larger than the allowed size (0.48828M).
errors found while checking: 1

==================== done running pydistcheck ===============

[jameslamb]

This was left behind in #303