perf(Schema): batch table introspection queries

[roxblnfk]

🔍 What was changed

• Table introspection batches its catalogue queries: CHECK/DEFAULT constraints and enum ranges are read once per table instead of once per column, and the index query is shared between fetchIndexes() and fetchPrimaryKeys(). Introspecting a 40-column table drops from dozens of round trips to a handful.
• New AbstractTable::resetIntrospectionCache() hook clears the memoized state before a schema is read and after DDL is applied.
• Postgres native enums resolve by type schema and name via pg_enum instead of enum_range() over the search_path. This fixes three bugs of the old text-based parsing:
  • a column typed with an enum from another schema picked up the values of a same-named type;
  • labels containing commas or quotes ('a,b', 'it''s') were split incorrectly — they are now returned verbatim;
  • an enum type without labels was reported as an enum with a single empty-string value — it is no longer treated as an enum.

The per-column queries stay as a fallback: the new createInstance() arguments are optional, so third-party callers are unaffected.

Why?

Introspection cost one query per column and per constraint, which dominates schema sync against a remote database.

Checklist

• Related issue: 💡 Cycle schema hydration is too slow orm#466 (introspection round trips are one part of the slow schema sync)
• How was this tested:
  • Unit tests added
  • SQLite, MySQL, SQL Server and Postgres suites pass locally

[codecov]

Codecov Report

❌ Patch coverage is 90.99099% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.48%. Comparing base (71a0a7f) to head (9648039).

Files with missing lines	Patch %	Lines
src/Driver/SQLServer/Schema/SQLServerColumn.php	54.54%	10 Missing ⚠️
src/Driver/Postgres/Schema/PostgresColumn.php	64.00%	9 Missing ⚠️
src/Driver/Postgres/Schema/PostgresTable.php	98.48%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #262      +/-   ##
============================================
- Coverage     95.73%   95.48%   -0.26%     
- Complexity     2078     2119      +41     
============================================
  Files           141      141              
  Lines          5862     5974     +112     
============================================
+ Hits           5612     5704      +92     
- Misses          250      270      +20     

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