Dynamically determine the version of the pip package.

[dbort]

Stack from ghstack (oldest at bottom):

• 3477

• 3476

• -> #3475

• 3474

• 3473

• 3472

• 3471

• 3470

• 3469

• 3468

• 3467

• 3466

Use the logic from https://github.com/pytorch/torcharrow/blob/15a7f7124d4c73c8c541547aef072264baab63b7/setup.py#L21 to play nicely with the pytorch ecosystem CI build environment.

Test Plan:

$ ./install_requirements.sh
...
Successfully installed executorch-0.2.0a0+1ba292a

$ python
>>> from executorch import version
>>> version.__version__
'0.2.0a0+1ba292a'
>>> version.git_version
'1ba292ae4071c4eede8ea14e8f10ffd973a085b4'
>>> ^D

$ grep Version /home/dbort/.conda/envs/executorch-tmp/lib/python3.10/site-packages/executorch-0.2.0a0+1ba292a.dist-info/METADATA
Metadata-Version: 2.1
Version: 0.2.0a0+1ba292a

Temporarily commented out the call to setup() in setup.py then imported it.

$ python
>>> from setup import Version
>>> Version.string
'0.2.0a0+1ba292a'
>>> Version.git_hash
'1ba292ae4071c4eede8ea14e8f10ffd973a085b4'
>>> Version.write_to_python_file("/tmp/version.py")
>>> ^D
$ cat /tmp/version.py
from typing import Optional
__all__ = ["__version__", "git_version"]
__version__ = "0.2.0a0+1ba292a"
git_version: Optional[str] = '1ba292ae4071c4eede8ea14e8f10ffd973a085b4'

$ BUILD_VERSION="5.5.5" python
>>> from setup import Version
>>> Version.string
'5.5.5'

Differential Revision: D56857484

[pytorch-bot[bot]]

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As of commit b7cc4cf2fcb372d5573d377dfeda0c9d1e35211e with merge base 5d2a17b29f57ab77f0481ca1d96d827e610dc4bf (): :green_heart: Looks good so far! There are no failures yet. :green_heart:

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[dbort]

@dbort has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

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@dbort merged this pull request in pytorch/executorch@b5dd169050057bb655a2eff2569fafc0a3edce61.