refactoring: split to smalller parts

TESTING.md

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+## Install ydb-platform/slo-tests
+
+GIT: https://github.com/ydb-platform/slo-tests.git
+Start `docker-compose up -d` to have YDB running in local container
+Check that YDB has started `http://localhost:8765/monitoring/cluster/tenants`
+
+## Install
+
+set YDB_ANONYMOUS_CREDENTIALS=1
+set YDB_SSL_ROOT_CERTIFICATES_FILE=C:\work\slo-tests\playground\data\ydb_certs\cert.pem
+set YDB_SDK_LOGLEVEL=debug
+npm run test:integration:development
+
+src/__tests__/bytestring-identity.test.ts
+src/__tests__/create-table.test.ts
+

src/credentials/AnonymousAuthService.ts

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+import * as grpc from "@grpc/grpc-js";
+import {IAuthService} from "./IAuthService";
+
+export class AnonymousAuthService implements IAuthService {
+    constructor() {}
+    public async getAuthMetadata(): Promise<grpc.Metadata> {
+        return new grpc.Metadata();
+    }
+}

src/credentials/IAuthService.ts

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+import * as grpc from "@grpc/grpc-js";
+
+export interface IAuthService {
+    getAuthMetadata: () => Promise<grpc.Metadata>,
+}

src/credentials/IIamCredentials.ts

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+export interface IIamCredentials {
+    serviceAccountId: string,
+    accessKeyId: string,
+    privateKey: Buffer,
+    iamEndpoint: string
+}