Fixes #4423 - Getter on mutations size

[gremi64]

Allow knowing the size of the list. For exemple, the batch size is limited to 500 mutations

Fixes#4423

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[gremi64]

I signed it!

[googlebot]

CLAs look good, thanks!

[gremi64]

Hi, i don't understant how it can fail on 2 files i didn't modify (and didn't commit) :
[ERROR] To fix formatting errors, run "mvn com.coveo:fmt-maven-plugin:format"
[ERROR] Non complying file: /tmpfs/src/github/google-cloud-java/google-api-grpc/proto-google-cloud-automl-v1beta1/src/main/java/com/google/cloud/automl/v1beta1/TextClassificationDatasetMetadata.java
[ERROR] Non complying file: /tmpfs/src/github/google-cloud-java/google-api-grpc/proto-google-cloud-automl-v1beta1/src/main/java/com/google/cloud/automl/v1beta1/ImageClassificationDatasetMetadata.java

[gremi64]

@ajaaym do i need to modify this two files ? Even if it has nothing to do with my PR

[ajaaym]

@gremi64 that will be fixed after #4437 is merged.

[sduskis]

@gremi64, it looks like you need to run mvn com.coveo:fmt-maven-plugin:format in order to fix some formatting problems in your code.

[gremi64]

@gremi64, it looks like you need to run mvn com.coveo:fmt-maven-plugin:format in order to fix some formatting problems in your code.

It's done :)