Add new 'mssql_role' resource to manipulate role of a SQL Server.

[paulbrittain]

Hello, I hope this PR finds you well.

The objective of this PR is primarily to add a new resource mssql_role for manipulating SQL Server Roles.

Other changes include

• Bumping dependency versions for the examples
• kreuzwerker is now the source for the docker provider https://registry.terraform.io/providers/kreuzwerker/docker/latest/docs
• Added the ability to debug the provider by passing a -debug flag parameter.
• Removed some unused code, such as in the function testAccImportStateId, now renamed to testResourceTryGetStateId
• Tests added
• Documentation added, changelog updated, and version bumped.

Note: I've tried to run the acceptance tests against Azure AD with no success. Further attempts are ongoing but the issue is likely related to Azure Firewall rules. Acceptance tests pass locally. I can provide an update here if progress is made.

If none is possible, can the acceptance tests be ran + verified by an existing pipeline or by a maintainer?

PS. The changelog needs to be updated with the diff link for the proposed minor verson bump when it's available.

Many thanks

[BasLangenberg]

Hi - Is there any chance this will be merged and pushed to the TF registry? We are having a need for this functionality at work as well. :-)

Thanks!