fix: capture Index Name from Bitmap Index Scan nodes

chore: migrate module path to v2 for semantic import versioning

Required so v2.x.x tags can be imported; Go's semantic import versioning
rejects v2+ tags at a module path without /v2.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

chore: switch to use fixturize binary instead library

preparing for Rust rewrite

release: pg_regresql 2.0 on PGXN

feat: enable VERBOSE and SETTINGS in all EXPLAIN calls

fix: switch from v0.1.0 of fixturize

feat: added fixture scaffolding

because fixtures are b....y difficult; scaffolding is meant to attempt to
generate the fixtures from the production environment (read-only), based
on pg_stats to get realistic data distribution.

generated file containts TODOs for user to fix. The problematic are
constraints

feat: include/restore statistics in snapshots (PG18+)

fix: PostgreSQL 18 fractional row counts in EXPLAIN output

Due to
> Modify EXPLAIN to output fractional row counts

feat: add PlanMetrics to extract EXPLAIN ANALYZE performance data