Bigtable: Increase timeout in table creation

[modular-magician]

When creating a table, Terraform first invokes Bigtable table creation and then follow and then adds column families. If a table is replicated, adding column families can be expansive and slow. When adding a column family times out, you will see an error like this "rpc error: code = Unavailable desc = The service is currently unavailable” while creating column family ???".

This PR sets overall timeout for table creation to 45 minutes and adds a longer timeout (5 minutes) when invoking ModifyColumnFamily API call.

fixes #12443

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bigtable: increased timeout in table creation.

Derived from GoogleCloudPlatform/magic-modules#6495

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