feat: support geospatial results on the kernel path

[cathleeny]

Summary

• add the kernel-only geospatialAsString connection option
• expose EWKT strings in string mode and canonical { srid, wkb: Buffer } values in binary mode
• keep the option entirely client-side (it is never forwarded to SEA)
• update the generated native declaration and pin local kernel builds to the exact kernel dependency commit below

Dependency

Depends on databricks/databricks-sql-kernel#361 at ad3bc6993bca95b810839feade77ccd0ab98ece5.

Keep this PR in draft until #361 is merged and native kernel packages containing that commit are available. The released optional native packages remain at 1.1.0 today; this PR intentionally does not invent a prerelease package version.

Validation

• Prettier and ESLint: passed
• production build/type-check: passed
• unit suite: 1,317 passed
• live Reyden E2E using the exact fix: address review feedback on telemetry infrastructure (#325 follow-up) #361 native addon: EWKT mode, binary {srid,wkb} mode, and nulls passed

npm run type-check also reaches an existing token-federation example self-import harness failure; the production npm run build type-check is green and this change does not touch that harness.