feat: add Trace V1

[bshaffer]

It seems like Trace V1 is an important library that we for some reason have never supported. Adding support for the upcoming major version release of google/cloud-trace.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• Trace/samples/V1/TraceServiceClient/get_trace.php:25, tag cloudtrace_v1_generated_TraceService_GetTrace_sync
• Trace/samples/V1/TraceServiceClient/list_traces.php:25, tag cloudtrace_v1_generated_TraceService_ListTraces_sync
• Trace/samples/V1/TraceServiceClient/patch_traces.php:25, tag cloudtrace_v1_generated_TraceService_PatchTraces_sync

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