Durable Actors 0.7.5

What's Changed

• Thomas/ter 756 update readme for tik tok brain by @tekaratzas in #129
• Use persistent Rapid append logs for actor state by @oliviersm199 in #130
• Remove persistence docs and experiment results requested in review by @oliviersm199 in #131
• Unify actor persistence on SQLite with managed Litestream IPC by @oliviersm199 in #105
• Update README.md by @oliviersm199 in #133
• Prepare 0.7.5 release and fix Rapid SQLite test fixtures by @oliviersm199 in #134

Full Changelog: v0.7.4...v0.7.5