message: fsprovider: Add sqltools filesystem scheme for completions
diff: import path from 'path';
  import fs from 'fs';
  import ConfigManager from '@sqltools/core/config-manager';
  -import { DISPLAY_NAME } from '@sqltools/core/constants';
  +import { DISPLAY_NAME, EXT_NAME } from '@sqltools/core/constants';
  import SQLTools from '@sqltools/core/plugin-api';
  import { commandExists, Telemetry } from '@sqltools/core/utils';
  import { env as VSCodeEnv, version as VSCodeVersion, workspace as Wspc, ExtensionContext, window, commands } from 'vscode';
  @@ -107,11 +107,12 @@ export class SQLToolsLanguageClient implements SQLTools.LanguageClientInterface
  if (typeof language === 'string') {
  agg.push({ language, scheme: 'untitled' });
  agg.push({ language, scheme: 'file' });
  + agg.push({ language, scheme: 'sqltools' });
  } else {
  agg.push(language);
  }
  return agg;
  - }, []);
  + }, [{ scheme: EXT_NAME.toLowerCase(), language: undefined }]);
  return {
  documentSelector: selector,
  @@ -120,7 +121,7 @@ export class SQLToolsLanguageClient implements SQLTools.LanguageClientInterface
  extensionPath: this.context.extensionPath,
  },
  synchronize: {
  - configurationSection: 'sqltools',
  + configurationSection: EXT_NAME.toLowerCase(),
  fileEvents: Wspc.createFileSystemWatcher('**/.sqltoolsrc'),
  },
  initializationFailedHandler: error => {
  