[WIP] Migrate bigquery and storage destination to modules

[umairidris]

@morgante an initial look to address #49 (comment).

Few comments currently:

• Left pubsub as the current pubsub module is need of a few changes of its own first including switching to for_each from count and supporting IAM.
• Few fields are missing in the storage/bigquery modules, will add them there first.
• This will obviously require a new major release and migration script to migrate to the modules.
• Also using this PR to improve some defaults and fix Convert force_destroy to a var in storage destination #50 for storage destination.

If you can give me an initial signal I can continue working on the steps above.

[morgante]

@umairidris Are you still working on this?

[umairidris]

I have not worked on this beyond what's in this PR and will likely not have bandwidth to continue this in the near future as I am no longer actively using these submodules.