feat: check status of long running operation by its name

[alexander-fenster]

For each client method returning a long running operation, a separate method to check its status is added.

Added methods: checkAnnotateVideoProgress.

[gcf-merge-on-green]

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[codecov]

Codecov Report

Merging #435 into master will increase coverage by 0.51%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
+ Coverage   94.55%   95.07%   +0.51%     
==========================================
  Files          12       12              
  Lines        2702     2882     +180     
  Branches      200      210      +10     
==========================================
+ Hits         2555     2740     +185     
+ Misses        142      137       -5     
  Partials        5        5              

Impacted Files	Coverage Δ
src/v1/video_intelligence_service_client.ts	94.84% <100.00%> (+0.63%)	⬆️
src/v1beta2/video_intelligence_service_client.ts	94.84% <100.00%> (+0.63%)	⬆️
src/v1p1beta1/video_intelligence_service_client.ts	96.90% <100.00%> (+0.47%)	⬆️
src/v1p2beta1/video_intelligence_service_client.ts	94.84% <100.00%> (+0.63%)	⬆️
src/v1p3beta1/video_intelligence_service_client.ts	94.84% <100.00%> (+0.63%)	⬆️

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