feat(angular): add option for initial context injection

Signed-off-by: Lukas Reining <lukas.reining@codecentric.de>

Author: lukas-reining

packages/angular/projects/angular-sdk/src/lib/open-feature.module.ts

@@ -1,10 +1,13 @@
 import { InjectionToken, ModuleWithProviders, NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
-import { OpenFeature, Provider } from '@openfeature/web-sdk';
+import { EvaluationContext, OpenFeature, Provider } from '@openfeature/web-sdk';
+
+export type EvaluationContextFactory = () => EvaluationContext;
 
 export interface OpenFeatureConfig {
   provider: Provider;
   domainBoundProviders?: Record<string, Provider>;
+  context?: EvaluationContext | EvaluationContextFactory;
 }
 
 export const OPEN_FEATURE_CONFIG_TOKEN = new InjectionToken<OpenFeatureConfig>('OPEN_FEATURE_CONFIG_TOKEN');
@@ -16,7 +19,9 @@ export const OPEN_FEATURE_CONFIG_TOKEN = new InjectionToken<OpenFeatureConfig>('
 })
 export class OpenFeatureModule {
   static forRoot(config: OpenFeatureConfig): ModuleWithProviders<OpenFeatureModule> {
-    OpenFeature.setProvider(config.provider);
+    const context = typeof config.context === 'function' ? config.context() : config.context;
+    OpenFeature.setProvider(config.provider, context);
+
     if (config.domainBoundProviders) {
       Object.entries(config.domainBoundProviders).map(([domain, provider]) =>
         OpenFeature.setProvider(domain, provider),