Fix incorrect BigQuery schema creation from FeatureSetSpec

[davidheryanto]

BOOL value type in FeatureSetSpec is registered as repeated mode in BigQuery, because of incorrect comparison of the type Enum. It should be a single (non repeated) mode.

The comparison:
https://github.com/gojek/feast/blob/1ef1b712b56c00504f37fa4396ed1ebdce625f6a/ingestion/src/main/java/feast/ingestion/utils/StoreUtil.java#L121

The proto for the enum:
https://github.com/gojek/feast/blob/1ef1b712b56c00504f37fa4396ed1ebdce625f6a/protos/feast/types/Value.proto#L34

This pull request:

1. Add a test to ensure correct BigQuery schema is created.
2. Compare using the enum name suffix versus the enum int value. This makes the comparison more explicit.

[feast-ci-bot]

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This pull-request has been approved by: davidheryanto

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[zhilingc]

/lgtm