feat!(): add custom execution context

lib/execution-context/telegraf-execution-context.ts

@@ -0,0 +1,32 @@
+import { ContextType, ExecutionContext } from '@nestjs/common';
+import { ExecutionContextHost } from '@nestjs/core/helpers/execution-context-host';
+import { TgArgumentsHost } from './tg-arguments-host.interace';
+
+export type TelegrafContextType = 'telegraf' | ContextType;
+
+export class TelegrafExecutionContext
+  extends ExecutionContextHost
+  implements TgArgumentsHost {
+  static create(context: ExecutionContext): TelegrafExecutionContext {
+    const type = context.getType();
+    const tgContext = new TelegrafExecutionContext(
+      context.getArgs(),
+      context.getClass(),
+      context.getHandler(),
+    );
+    tgContext.setType(type);
+    return tgContext;
+  }
+
+  getType<TContext extends string = TelegrafContextType>(): TContext {
+    return super.getType();
+  }
+
+  getContext<T = any>(): T {
+    return this.getArgByIndex(0);
+  }
+
+  getNext<T = any>(): T {
+    return this.getArgByIndex(0);
+  }
+}