message: fix(localize): include meaning in generated ARB files
  The ARB format doesn't have a dedicated field for message meaning so these changes include it
  as a customize attribute called `x-meaning`.
  Fixes
  PR Close
diff: @@ -64,7 +64,8 @@ runInEachFileSystem(() => {
  ' "13579": "{$START_BOLD_TEXT}b{$CLOSE_BOLD_TEXT}",',
  ' "24680": "a",',
  ' "@24680": {',
  - ' "description": "and description"',
  + ' "description": "and description",',
  + ' "x-meaning": "meaning"',
  ' },',
  ' "80808": "multi\\nlines",',
  ' "90000": "<escape{$double-quotes-\\"}me>",',
  @@ -72,6 +73,7 @@ runInEachFileSystem(() => {
  ' "100001": "{VAR_PLURAL, plural, one {{START_BOLD_TEXT}something bold{CLOSE_BOLD_TEXT}} other {pre {START_TAG_SPAN}middle{CLOSE_TAG_SPAN} post}}",',
  ' "12345": "a{$PH}b{$PH_1}c",',
  ' "@12345": {',
  + ' "x-meaning": "some meaning",',
  ' "x-locations": [',
  ' {',
  ' "file": "file.ts",',
  