[ENH] use sub commands for python CLI

[Remi-Gau]

• closes #1279
• relates to #1127 (add BMS to CLI)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 2.73973% with 284 lines in your changes missing coverage. Please review.

Project coverage is 76.28%. Comparing base (f53979a) to head (63c4cea). Report is 112 commits behind head on main.

Files	Patch %	Lines
src/bidspm/bidspm.py	0.00%	117 Missing :warning:
src/bidspm/parsers.py	0.00%	104 Missing :warning:
src/bidspm/cli.py	0.00%	63 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1292 +/- ## ========================================== - Coverage 79.57% 76.28% -3.30% ========================================== Files 285 291 +6 Lines 7742 8074 +332 Branches 40 64 +24 ========================================== - Hits 6161 6159 -2 - Misses 1565 1915 +350 + Partials 16 0 -16 ``` | [Flag](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | Coverage Δ | | |---|---|---| | [cli](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `0.00% <0.00%> (-39.00%)` | :arrow_down: | | [macos-13_matlab-R2023b_fast](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `60.51% <50.00%> (?)` | | | [macos-13_matlab-R2023b_slow](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `58.38% <87.50%> (?)` | | | [macos-latest_matlab-R2023a_fast](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `?` | | | [macos-latest_matlab-R2023a_slow](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `?` | | | [octave](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `76.47% <100.00%> (+0.76%)` | :arrow_up: | | [ubuntu-latest_matlab-R2023a_fast](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `?` | | | [ubuntu-latest_matlab-R2023a_slow](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `?` | | | [ubuntu-latest_matlab-R2023b_fast](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `60.51% <50.00%> (?)` | | | [ubuntu-latest_matlab-R2023b_slow](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `58.37% <87.50%> (?)` | | | [windows-latest_matlab-R2023b_slow](https://app.codecov.io/gh/cpp-lln-lab/bidspm/pull/1292/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab) | `58.38% <87.50%> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=cpp-lln-lab#carryforward-flags-in-the-pull-request-comment) to find out more.

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