feat: devenv, uv, pre-commit

[joshuarli]

This introduces devenv, uv and pre-commit in accordance with these repo standards:
https://www.notion.so/sentry/Standard-Spec-devenv-2238b10e4b5d8072a992d8b67d94be22
https://www.notion.so/sentry/Standard-Spec-python-uv-2248b10e4b5d8045b8fff30f8b8b67ca
https://www.notion.so/sentry/Standard-Spec-pre-commit-2238b10e4b5d8019aa1fe1158e39c38e

The ability to run devenv sync and get a dev environment in any repo is the DX i'm aiming for,
and these standards provide a foundation from which later we can easily push updates to all repos.

You should be able to checkout this branch, run direnv allow and devenv sync (might be prompted to run ~/.local/share/sentry-devenv/bin/devenv update first), which will set up everything needed for development (other than cargo).

Notes:

• I was also able to add rustfmt as a local pre-commit hook (need to keep the rust edition in sync with cargo.toml it seems) but it seems like clippy doesn't work on individual files (perhaps clippy-driver?) - anyway, decided not to touch these parts for now to keep things simple.

[loewenheim]

I honestly question the utility of clippy being a pre-commit hook. I don't think it's helpful to require all individual commits to be correctly linted, and you can't merge without it anyway.

[joshuarli]

I honestly question the utility of clippy being a pre-commit hook. I don't think it's helpful to require all individual commits to be correctly linted, and you can't merge without it anyway.

Yeah, I just realized clippy/clippy-driver is a wrapper around rustc - rust linting inherently requires compilation, making it too slow for pre-commit anyways.