[misc] Add release script

[ebezzi]

Adds an helper script that can be used to facilitate the release process.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.31%. Comparing base (dff0b6a) to head (799f929). Report is 29 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1050 +/- ## ========================================== + Coverage 76.94% 81.31% +4.37% ========================================== Files 72 73 +1 Lines 5691 5551 -140 ========================================== + Hits 4379 4514 +135 + Misses 1312 1037 -275 ``` | [Flag](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/1050/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/chanzuckerberg/cellxgene-census/pull/1050/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=chanzuckerberg) | `81.31% <ø> (+4.37%)` | :arrow_up: | 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=chanzuckerberg#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

This PR has not seen any activity in the past 4 weeks; if no one comments or reviews it in the next 3 days, this PR will be closed.

[prathapsridharan]

@ebezzi - Maybe we close this?

[ebezzi]

Closing this for now, as the benefits in having this script are minimal. We can always resurrect this later if necessary.