UX: Rename Crate\PDO\PDO to Crate\PDO\PDOCrateDB

[amotl]

As a followup to GH-145, this patch concludes the renaming. In order to not break existing code, a compatibility shim has been added at Crate\PDO\PDO, which will be removed on a later release.

[amotl]

CI observations

I don't know why Codecov complains here.

[codecov/patch] Failing after 1s — 84.87% of diff hit (target 89.37%)

From my perspective, it does not look too bad?

-- https://github.com/crate/crate-pdo/pull/148/checks?check_run_id=13344646751
-- https://app.codecov.io/gh/crate/crate-pdo/pull/148

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But indeed, Scrutinizer also reports about it:

Test Coverage has decreased to 88% (-2%).

-- https://scrutinizer-ci.com/g/crate/crate-pdo/inspections/92013af8-5ae5-4551-917c-bb6dc140f542

Question

Do you think we can tolerate it?

[seut]

Nice! But we should mention this at the CHANGES or?