Query rewrite engine 3.0 (part 1 of many)

[levkk]

• feat: add support for inserting pgdog.unique_id() pretty much anywhere in the query
• feat: unique_id generation is now sync, so it can be used anywhere
• chore: move PREPARE/EXECUTE support into new rewrite engine
• chore: started moving INSERT splitting into new engine (not ready)
• chore: clippy

[codecov]

Codecov Report

❌ Patch coverage is 76.94460% with 412 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pgdog/src/stats/rewrite_stats.rs	0.00%	83 Missing ⚠️
pgdog/src/frontend/router/rewrite/request.rs	60.19%	41 Missing ⚠️
pgdog/src/frontend/router/rewrite/unique_id/mod.rs	75.92%	39 Missing ⚠️
...og/src/frontend/router/rewrite/unique_id/select.rs	83.04%	39 Missing ⚠️
pgdog/src/admin/show_rewrite.rs	0.00%	28 Missing ⚠️
...g/src/frontend/prepared_statements/global_cache.rs	25.00%	21 Missing ⚠️
...g/src/frontend/router/rewrite/unique_id/explain.rs	90.32%	18 Missing ⚠️
...og/src/frontend/client/query_engine/route_query.rs	36.00%	16 Missing ⚠️
pgdog/src/net/messages/bind.rs	70.37%	16 Missing ⚠️
pgdog/src/frontend/router/parser/cache.rs	59.45%	15 Missing ⚠️
... and 23 more

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