feat(maps-isochrones): onboard v1 API

[noahdietz]

Onboard Maps Isochrones v1 API.

Internal intake bug http://b/529841680

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservice/create/SyncCreateSetCredentialsProvider.java:19, tag isochrones_v1_generated_IsochroneService_Create_SetCredentialsProvider_sync
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservice/create/SyncCreateSetEndpoint.java:19, tag isochrones_v1_generated_IsochroneService_Create_SetEndpoint_sync
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservice/create/SyncCreateUseHttpJsonTransport.java:19, tag isochrones_v1_generated_IsochroneService_Create_UseHttpJsonTransport_sync
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservice/generateisochrone/AsyncGenerateIsochrone.java:19, tag isochrones_v1_generated_IsochroneService_GenerateIsochrone_async
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservice/generateisochrone/SyncGenerateIsochrone.java:19, tag isochrones_v1_generated_IsochroneService_GenerateIsochrone_sync
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/isochroneservicesettings/generateisochrone/SyncGenerateIsochrone.java:19, tag isochrones_v1_generated_IsochroneServiceSettings_GenerateIsochrone_sync
• java-maps-isochrones/samples/snippets/generated/com/google/maps/isochrones/v1/stub/isochroneservicestubsettings/generateisochrone/SyncGenerateIsochrone.java:19, tag isochrones_v1_generated_IsochroneServiceStubSettings_GenerateIsochrone_sync

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[gemini-code-assist]

Code Review

This pull request introduces the Google Isochrones Client for Java (java-maps-isochrones), adding a new idiomatic Java client library for the Isochrones API (isochrones.googleapis.com). The addition includes the main client library, gRPC and proto modules, a BOM module, auto-generated GAPIC code, tests, samples, and documentation. Additionally, the root pom.xml, librarian.yaml, and versions.txt are updated to integrate and version the new library. There are no review comments to address.