Provider-level caching for historic requests (#4195)

* Provider-level caching for historic requests

* LRUCache

* Adjust

* Adjust

* Adjust

* Opts

* private variables

* Implementation link

* lru .entries adjustment (using .keys)

* Adjust expectations

packages/rpc-core/src/bundle.ts

@@ -204,7 +204,7 @@ export class RpcCore {
         ? await this.#getBlockRegistry(u8aToU8a(blockHash))
         : { registry: this.#registryDefault };
       const params = this._formatInputs(registry, null, def, values);
-      const result = await this.provider.send<AnyJson>(rpcName, params.map((p) => p.toJSON()));
+      const result = await this.provider.send<AnyJson>(rpcName, params.map((p) => p.toJSON()), !!blockHash);
 
       return this._formatResult(isScale, registry, blockHash, method, def, params, result);
     };

packages/rpc-core/src/methodSend.spec.ts

@@ -62,7 +62,7 @@ describe('methodSend', (): void => {
     // eslint-disable-next-line @typescript-eslint/no-unsafe-call,@typescript-eslint/no-unsafe-member-access
     method(new Uint8Array([2 << 2, 0x12, 0x34])).subscribe((): void => {
       // eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
-      expect(provider.send).toHaveBeenCalledWith('test_blah', ['0x1234']);
+      expect(provider.send).toHaveBeenCalledWith('test_blah', ['0x1234'], false);
       done();
     });
   });