Implement metadata-filtered document + event queries (#4791)

[jeremydmiller]

Summary

• Implements the three new exact-match metadata filters from JasperFx.Events 2.18.0's DocumentQueryOptions / EventQuery (jasperfx/CritterWatch#629).
• Documents — DocumentStore.DocumentDiagnostics.cs extends the existing SQL builder (already conjoining id::text = @id + tenant_id = @tenant) with correlation_id, causation_id, last_modified_by WHERE clauses. Each filter is honored only when (a) the option is set AND (b) the document mapping has the corresponding metadata column enabled — emitting a WHERE on a column the table doesn't have would throw 42703 undefined_column.
• Events — QueryEventStore.cs extends the LINQ predicate chain with CorrelationId / CausationId / UserName Where clauses, gated on EventGraph.Metadata.X.Enabled (mirrors the gate in EventQueryMapping.cs:46-59 that conditionally registers the queryable member).
• When a filter is set but the column is disabled the filter is silently skipped (per the JasperFx contract: "Only honored when the store advertises and captures the metadata column; otherwise ignored").
• Bumps JasperFx + JasperFx.Events + both source generators 2.17.0 → 2.18.0.

Test plan

Tests land in DocumentDbTests/Metadata — 28 tests total, all green on net10.

Seeding strategy: each suite seeds 8 docs / 8 events whose metadata cover every combination of corr ∈ {c0, c1} × caus ∈ {u0, u1} × lmb/user ∈ {b0|n0, b1|n1}, indexed 0..7 by the binary tuple. Each filter combo's expected subset is then a precise list of indices.

document_diagnostics_metadata_filter_tests.cs — 14 tests

• every_filter_combo_returns_the_expected_subset Theory — 8 cases walking every (corr × caus × lmb) on/off permutation
• filter_on_an_unmatched_value_returns_zero_rows
• filter_is_silently_ignored_when_correlation_id_column_is_disabled
• filter_is_silently_ignored_when_causation_id_column_is_disabled
• filter_is_silently_ignored_when_last_modified_by_column_is_disabled
• filter_set_alongside_an_enabled_filter_when_a_column_is_disabled_still_narrows_via_the_enabled_one
• IdEquals_and_metadata_filters_compose_with_AND

event_diagnostics_metadata_filter_tests.cs — 14 tests

Same 8-event matrix + 6 targeted Facts mirroring the doc-side shape, plus a compose-with-EventTypeName regression guard.

• All 28 new tests green locally
• Existing document_store_diagnostics_tests (CoreTests, 9 tests) still green
• CI matrix (PG 15/latest × net8/net10 × Newtonsoft/STJ)

Notes

• Deferred per the issue's v1 scope: headers JSON containment + timestamp ranges.

Closes #4791

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