feat(query): add shared query base classes

[nkanu17]

Summary

This PR adds the shared query foundation needed for the remaining RedisVL Python parity work.

• Adds BaseQuery for common FT.SEARCH query state and validation.
• Adds BaseVectorQuery for vector-specific state, datatype normalization, and shared vector validation.
• Moves VectorQuery, VectorRangeQuery, FilterQuery, CountQuery, and TextQuery onto the shared base classes without changing their constructor-facing APIs.
• Adds chainable query helpers:
  • setFilter(...)
  • setReturnFields(...)
  • paging(...)
  • sortBy(...)
• Wires query-level sortBy() through SearchIndex.search().

Stacking

This PR is stacked on top of #9 (feat/hybrid-search).

Do not merge this PR before #9 lands.

TDD Notes

Tests were written first and failed before implementation:

• tests/unit/query/base.test.ts
  • BaseQuery common config, filter updates, return fields, skip-decode fields, paging, sorting, and validation.
  • BaseVectorQuery vector state, datatype normalization, defensive copying, and validation.
• tests/unit/query/vector.test.ts
  • VectorQuery inheritance from BaseVectorQuery / BaseQuery.
  • Chainable paging, setReturnFields, and setFilter behavior.
• tests/unit/indexes/search-index.test.ts
  • Query-level sortBy() reaches FT.SEARCH options.

Implementation followed after the failing tests were in place.

Verification

• npm run type-check
• npm run test:unit
• npm run format:check -- src/query/base.ts src/query/vector.ts src/query/range.ts src/query/filter-query.ts src/query/count.ts src/query/text.ts src/indexes/search-index.ts tests/unit/query/base.test.ts tests/unit/query/vector.test.ts tests/unit/indexes/search-index.test.ts
• npm run build
• REDISVL_SKIP_HYBRID=true npm test -- tests/integration

[nkanu17]

Closing this for now. This stacked Query Core branch should only become a PR if/when we explicitly decide to add new scope on top of #9.

[nkanu17]

PR Notes\n\nReopened this as the next feature branch stacked on #9.\n\n- Base branch: \n- Head branch: \n- Scope: shared query foundation only\n\nThis should stay blocked on #9 landing first.

[nkanu17]

PR Notes

Reopened this as the next feature branch stacked on #9.

• Base branch: feat/hybrid-search
• Head branch: stack/query-core-on-hybrid
• Scope: shared query foundation only

This should stay blocked on #9 landing first.