message: fix(shell-api): add returnType annotations for FLE methods
diff: @@ -278,6 +278,7 @@ export default class Mongo extends ShellApiClass {
  @platforms([ReplPlatform.CLI])
  @serverVersions(['4.2.0', ServerVersions.latest])
  + @returnType('ClientEncryption')
  getClientEncryption(): ClientEncryption {
  if (!this._clientEncryption) {
  this._clientEncryption = new ClientEncryption(this);
  @@ -287,6 +288,7 @@ export default class Mongo extends ShellApiClass {
  @platforms([ReplPlatform.CLI])
  @serverVersions(['4.2.0', ServerVersions.latest])
  + @returnType('KeyVault')
  getKeyVault(): KeyVault {
  this._keyVault = new KeyVault(this.getClientEncryption());
  return this._keyVault;
  