feat(preprod): Add snapshots subcommand

[noahsmartin]

Just sharing this early version of a snapshot upload command to collaborate on it. A lot is still TBD such as objectstore public endpoints and connection pooling

[github-actions]

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🚫	Please consider adding a changelog entry for the next release.

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Please add an entry to CHANGELOG.md to the "Unreleased" section. Make sure the entry includes this PR's number.

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## Unreleased

### Features

- Add snapshots subcommand ([#3049](https://github.com/getsentry/sentry-cli/pull/3049))

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