feat(module-federation): support setremotedefinition api (#27051)

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## Current Behavior
The only method available to manage remotes is `setRemoteDefinitions`
method, that overwrite the previous state, as expected. The problem is
that in some cases, when it needed to add more remotes dynamically, this
API replace it current state, removing the previous remotes.

## Expected Behavior
Expose a new API called `setRemoteDefinition(remoteName: string,
remoteUrl: string)` that adds or replace a new remote definition in the
remotes map, without overwrite the remotes map.

## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->

Fixes #27050

---------

Co-authored-by: Guilherme Prezzi <[email protected]>

packages/angular/mf/mf.ts

@@ -12,11 +12,15 @@ export function setRemoteUrlResolver(
   resolveRemoteUrl = _resolveRemoteUrl;
 }
 
-let remoteUrlDefinitions: Record<string, string>;
+let remoteUrlDefinitions: Record<string, string> = {};
 export function setRemoteDefinitions(definitions: Record<string, string>) {
   remoteUrlDefinitions = definitions;
 }
 
+export function setRemoteDefinition(remoteName: string, remoteUrl: string) {
+  remoteUrlDefinitions[remoteName] = remoteUrl;
+}
+
 let remoteModuleMap = new Map<string, unknown>();
 let remoteContainerMap = new Map<string, unknown>();
 export async function loadRemoteModule(remoteName: string, moduleName: string) {

packages/react/mf/dynamic-federation.ts

@@ -15,7 +15,7 @@ declare const document: {
 
 declare const __webpack_init_sharing__: (scope: 'default') => Promise<void>;
 declare const __webpack_share_scopes__: { default: unknown };
-let remoteUrlDefinitions: Record<string, string>;
+let remoteUrlDefinitions: Record<string, string> = {};
 let resolveRemoteUrl: ResolveRemoteUrlFunction;
 const remoteModuleMap = new Map<string, unknown>();
 const remoteContainerMap = new Map<string, unknown>();
@@ -31,6 +31,10 @@ export function setRemoteDefinitions(definitions: Record<string, string>) {
   remoteUrlDefinitions = definitions;
 }
 
+export function setRemoteDefinition(remoteName: string, remoteUrl: string) {
+  remoteUrlDefinitions[remoteName] = remoteUrl;
+}
+
 export async function loadRemoteModule(remoteName: string, moduleName: string) {
   const remoteModuleKey = `${remoteName}:${moduleName}`;
   if (remoteModuleMap.has(remoteModuleKey)) {