Sentry-kafka-schemas

Various fixes & improvements

- fix: Fix Rust test breakage and add Rust CI (107) by untitaker

Various fixes & improvements

- fix: Fix wording in json-schema-diff (103) by untitaker
- fix(transactions): Fix transactions "data" to exclude stuff Snuba doesn't care about (102) by lynnagara
- fix: Bump json-schema-diff to 0.1.4 (101) by untitaker

Various fixes & improvements

- fix(transactions): Remove some stuff Snuba doesn't care about (99) by lynnagara
- fix(events): Fix the schema for tombstone events (98) by lynnagara
- fix(rust): Make regress dependency optional as well (100) by untitaker

Various fixes & improvements

- fix: Make generated schema types an optional feature (96) by untitaker
- fix: Impl std::error::Error for SchemaError (95) by untitaker
- fix: Bump json-schema-diff to 0.1.2 (94) by untitaker
- docs: Clarify that bumping the version is part of the release process (92) by lynnagara
- feat: Remove unused fields from subscription results (88) by lynnagara
- ref: Loosen transaction schema (93) by lynnagara

Various fixes & improvements

- feat: Add Rust build cache to reduce CI times (89) by untitaker
- fix: Align snuba-metric value field with ingest-metrics (90) by untitaker

Various fixes & improvements

- docs: Add some guidance about schema strictness (91) by lynnagara
- fix: Loosen transactions schema, add example (87) by lynnagara
- fix: Standardise retention_days on events and transactions (86) by lynnagara
- fix: Lint against dead schema files unreferenced by any topic (85) by untitaker
- fix(events): We seem to be getting transaction_id in end_unmerge now (79) by lynnagara
- fix: Make schema-changes workflow faster (84) by untitaker