feat: add support for StyleSheet annotation hotswap

[mcollovati]

Implements hotswap for changes related to the StyleSheet annotation. Reacts on adding, removing or updating the value of the annotation on AppShellConfigurator and Component subclasses, by registering or unregistering the stylesheet with the API provided by UI and UIInternals classes

Fixes #22631

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Test Results

1 291 files  ± 0  1 291 suites  ±0   1h 14m 37s ⏱️ +12s
9 026 tests +16  8 958 ✅ +16  68 💤 +1  0 ❌ ±0 
9 487 runs  +24  9 408 ✅ +24  79 💤 +1  0 ❌ ±0 

Results for commit c4c9af7. ± Comparison against base commit aebe283.

This pull request removes 3 and adds 19 tests. Note that renamed tests count towards both.

com.vaadin.flow.component.dependency.StyleSheetHotswapperTest ‑ cssResourceChange_knownPublicPaths_triggersLiveReloadUpdateWithRelativePath
com.vaadin.flow.component.dependency.StyleSheetHotswapperTest ‑ resourceChanged_cssNotIKnownPublicPath_ignore
com.vaadin.flow.component.dependency.StyleSheetHotswapperTest ‑ resourceChanged_notCss_ignore

com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ cssResourceChange_knownPublicPaths_triggersLiveReloadUpdateWithRelativePath
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassChange_appShellInitialStateUpdated
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_appShellAddAnnotation_addsStylesheet
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_appShellModifyAnnotation_updatesStylesheet
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_appShellMultipleAnnotations_handlesMultiple
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_appShellNotRegistered_doesNothing
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_appShellRemoveAnnotation_removesStylesheet
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_closingUI_skipped
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_componentInUse_addsStylesheet
com.vaadin.flow.component.internal.StyleSheetHotswapperTest ‑ onClassesChange_componentModifyAnnotation_updatesStylesheet
…