Proposal: Add `context`-aware variants of functions in `resource.TestCase`

[gdavison]

Use cases

In some cases, TestCheckFuncs, ErrorCheckFuncs, etc., may need to log. Without access to a context, they won't have access to a tflog.

Providers can recreate their own test logger (e.g. hashicorp/terraform-provider-aws#29764), but don't have access to the test_step_number and other logging fields.

Attempted solutions

Implemented our own with only the test_name field in hashicorp/terraform-provider-aws#29764

Proposal

Add context-aware versions of functions passed to resource.TestCase so that the logging context supplied by the testing framework can be passed