Overhaul acp search (#6682)

- Built-in providers registered via the new PSR-14
  ProviderCollecting event instead of the DBO/PIP. The PIP, DBO,
  cache builder, and legacy ACPSearchProviderAction are marked
  @deprecated 6.3 and the acpSearchProvider PIP instruction is
  dropped from package.xml.
- New RPC endpoint GET /core/acp/search replaces
  ACPSearchProviderAction::getSearchResultList(). Permission is
  gated by admin.general.canUseAcp; each provider still enforces
  its own admin permission.
- WCF.ACP.Search jQuery class rewritten as the TypeScript module
  WoltLabSuite/Core/Acp/Ui/Search (with API client
  WoltLabSuite/Core/Api/Acp/Search). Bootstrap initializes it
  automatically; the legacy `new WCF.ACP.Search()` call in
  header.tpl is removed.

Closes #6681

Author: BurntimeX

com.woltlab.wcf/acpSearchProvider.xml

@@ -29,7 +29,6 @@
 		<instruction type="clipboardAction" />
 		<instruction type="objectTypeDefinition" />
 		<instruction type="objectType" />
-		<instruction type="acpSearchProvider" />
 		<instruction type="style">defaultStyle.tar</instruction>
 
 		<instruction type="userOption" run="standalone" />

com.woltlab.wcf/package.xml

@@ -10,6 +10,7 @@ import * as Core from "../Core";
 import { BoostrapOptions, setup as bootstrapSetup } from "../Bootstrap";
 import * as UiPageMenu from "./Ui/Page/Menu";
 import AcpUiPageMenuMainBackend from "./Ui/Page/Menu/Main/Backend";
+import { setup as setupAcpSearch } from "./Ui/Search";
 
 interface AcpBootstrapOptions {
   bootstrap: BoostrapOptions;
@@ -33,4 +34,5 @@ export function setup(options: AcpBootstrapOptions): void {
 
   bootstrapSetup(options.bootstrap);
   UiPageMenu.init();
+  setupAcpSearch();
 }