Remove unnecessary read calls

[adam-daily]

Issue #, if available:

Description of changes:

This change removes read calls from the LogGroup Create and Update handlers that could be causing undue stress on Lambda functions.

The change also adds role details generated by RPDK.

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[rjlohan]

Probably didn't need to regen the roles in other types but whatevs. 🚂

[adam-daily]

Nice, also might be useful to get rid of the initial read and rely on AlreadyExists being returned from create.

Good call, I'll get rid of it.