Add component: key support to block config resolution

[helmutkaufmann]

Split out of #68 (closed in favor of smaller, focused PRs).

Summary

• A block can declare a top-level component: key to derive default fields from a CMS component's defineProperties(), instead of (or alongside) hand-written fields:.
• Component properties are converted to block fields (title → label, description → comment, default, placeholder, options), with property types mapped to field types.
• The block's own fields: always take precedence over fields derived from the component on key collision. If the component can't be resolved, a warning is logged and the block's own fields are used as-is.

See the README section "Deriving fields from a component" for usage.

Test plan

• New tests in tests/classes/BlockManagerTest.php covering property merge, override precedence, and unresolvable-component handling, plus an end-to-end test via a real .block file
• Full plugin test suite passes (php artisan winter:test -p Winter.Blocks)

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📥 Commits

Reviewing files that changed from the base of the PR and between 394377b and b55c419.

📒 Files selected for processing (7)

• CHANGELOG.md
• README.md
• classes/BlockManager.php
• tests/classes/BlockManagerTest.php
• tests/fixtures/blocks/with_component.block
• tests/fixtures/components/TestComponent.php
• updates/version.yaml

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