refactor: extract Configure and Metadata framework functions into single implementation

[AgustinBettati]

Description

Small refactor that removes boilerplate definition of Metadata and Configure functions in all our plugin-framework resources and data sources into common structs.

Type of change:

• Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR.
• Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR.
• This change requires a documentation update
• Documentation fix/enhancement

Required Checklist:

• I have signed the MongoDB CLA
• I have read the contribution guidelines
• I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code

Further comments

[andreaangiolillo]

LGTM. My comments are not blocking the PR

[andreaangiolillo]

Does it make sense to move this struct in a subdir to make it clear that does not define a resource or ds?

[AgustinBettati]

Had looked into this but reached a limitation. When defining fw_common.go within framework package, I need to import mongodbatlas package to reference MongoDBClient. This leads to an import cycle not allowed error.

[maastha]

LGTM, thank you for this one!