jetbrains: reimplement update scripts

This adds `passthru.updateScript` to the IDEs for automatic updates and
rewrites all existing update scripts into one Python CLI app. This app
is re-using most of the existing scripts in some way:

- Most of `bin/update_bin.py` has been moved to
  `updater/jetbrains_nix_updater/fetcher.py`
- Most of `source/update.py` has been moved to
  `updater/jetbrains_nix_updater/update_src.py`
- `source/build_maven.py` has been moved almost as-is to
  `updater/jetbrains_nix_updater/update_src_maven.py`

Since we are now no longer using JSON files but Nix files directly, I
opted to use a simple "marker" approach for replacing things like
versions and URLs in the files. I didn't want to implement complicated
regex patterns like the `update-source-version` script does, it seemed
overkill and I wanted to keep things as simple as possible.

Co-Authored-By: Matt Sturgeon <matt@sturgeon.me.uk>

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