doc: gcp bulkGet, copy, rename, move docs

[nelson-parente]

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Description

Docs for the operations added here: dapr/components-contrib#3810
Docs for bulkGet added here: dapr/components-contrib#3811

Issue reference

dapr/components-contrib#3157
dapr/components-contrib#3655

[msfussell]

@nelson-parente -

1. This PR should be targeted at v1.16 docs branch
2. Update this list of operations here https://docs.dapr.io/reference/components-reference/supported-bindings/gcpbucket/#binding-support adding the three new ones
3. Remove the "waiting on code" label once this is merged into components contrib.

[nelson-parente]

closing in favor of: #4662 that targets 1.16 branch