Add empty data source plugin (#2052)

Adds empty data source plugin.

src/plugins/data_source/README.md

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+# data_source
+
+A OpenSearch Dashboards plugin
+
+This plugin introduce OpenSearch data source into OpenSearch Dashboards, and provides related functions to connect to OpenSearch data sources.
+
+---
+
+## Development
+
+See the [OpenSearch Dashboards contributing
+guide](https://github.com/opensearch-project/OpenSearch-Dashboards/blob/main/CONTRIBUTING.md) for instructions
+setting up your development environment.

src/plugins/data_source/common/index.ts

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+export const PLUGIN_ID = 'dataSource';
+export const PLUGIN_NAME = 'data_source';

src/plugins/data_source/opensearch_dashboards.json

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+{
+  "id": "dataSource",
+  "version": "opensearchDashboards",
+  "opensearchDashboardsVersion": "opensearchDashboards",
+  "server": true,
+  "ui": false,
+  "requiredPlugins": [],
+  "optionalPlugins": []
+}

src/plugins/data_source/server/index.ts

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { schema, TypeOf } from '@osd/config-schema';
+import { PluginConfigDescriptor, PluginInitializerContext } from 'src/core/server';
+import { DataSourcePlugin } from './plugin';
+
+export const configSchema = schema.object({
+  enabled: schema.boolean({ defaultValue: false }),
+});
+
+export type DataSourcePluginConfigType = TypeOf<typeof configSchema>;
+
+export const config: PluginConfigDescriptor<DataSourcePluginConfigType> = {
+  schema: configSchema,
+};
+
+export function plugin(initializerContext: PluginInitializerContext) {
+  return new DataSourcePlugin(initializerContext);
+}
+
+export { DataSourcePluginSetup, DataSourcePluginStart } from './types';

src/plugins/data_source/server/plugin.ts

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { PluginInitializerContext, CoreSetup, CoreStart, Plugin, Logger } from 'src/core/server';
+
+import { DataSourcePluginSetup, DataSourcePluginStart } from './types';
+
+export class DataSourcePlugin implements Plugin<DataSourcePluginSetup, DataSourcePluginStart> {
+  private readonly logger: Logger;
+
+  constructor(initializerContext: PluginInitializerContext) {
+    this.logger = initializerContext.logger.get();
+  }
+
+  public setup(core: CoreSetup) {
+    this.logger.debug('data_source: Setup');
+
+    return {};
+  }
+
+  public start(core: CoreStart) {
+    this.logger.debug('data_source: Started');
+    return {};
+  }
+
+  public stop() {}
+}

src/plugins/data_source/server/types.ts

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+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface DataSourcePluginSetup {}
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
+export interface DataSourcePluginStart {}