fix: Adjust moto fixtures to work correctly with scopes and to propag…

[DanCardin]

…ate credentials down directly.

Unfortunately this contains a breaking change from the use of the pmr_moto_credentials fixture (removed by this PR), switching to <fixturename>.pmr_credentials, which more closely resembles the interface the rest of the fixtures expose.

i.e.

from pytest_mock_resources.fixture.moto import Session, Credentials

def test_foo(moto: Session, pmr_moto_credentials: Credentials):
    endpoint_url = pmr_moto_credentials.endpoint_url
# ->
def test_foo(moto: Session):
    endpoint_url = moto.pmr_credentials.endpoint_url

The prior interface did/does not play well with different scoping settings, nor does it play well with fixture-local options to the client/resource functions (like `region_name`).

Given the lack of recency of the moto feature and lack of evidence of existing use, the fact that the prior interface was badly designed (non-functional with anything but function scope), and the simplicity of the conversion, the version bump will be a minor release.

[coveralls]

Pull Request Test Coverage Report for Build 5533933721

• 17 of 17 (100.0%) changed or added relevant lines in 2 files are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.3%) to 90.694%

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Files with Coverage Reduction	New Missed Lines	%
src/pytest_mock_resources/container/base.py	2	82.27%
src/pytest_mock_resources/compat/init.py	4	81.08%
<!--	Total:	6		-->

Totals
Change from base Build 5215975220:	-0.3%
Covered Lines:	1385
Relevant Lines:	1516

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💛 - Coveralls