Switch away from nesting React trees and mangling the DOM (#29586)

* Switch away from nesting React trees and mangling the DOM

By parsing HTML events and manipulating the AST before passing it to React

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Use MatrixClientContext in Pill now that we are in the main React tree

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Add missing import

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Break import cycles

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Minimise

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Docs

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

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Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

test/test-utils/client.ts

@@ -115,6 +115,16 @@ export const mockClientMethodsEvents = () => ({
     getPushActionsForEvent: jest.fn(),
 });
 
+/**
+ * Returns basic mocked pushProcessor
+ */
+export const mockClientPushProcessor = () => ({
+    pushProcessor: {
+        getPushRuleById: jest.fn(),
+        ruleMatchesEvent: jest.fn(),
+    },
+});
+
 /**
  * Returns basic mocked client methods related to server support
  */