Add support for TMX (Translation Memory eXchange) file format

[vrcprl]

What

Implement a loader for TMX files in Replexica.

Why

To support translation agencies, LSPs, and translators using CAT tools and translation memory sharing.

How

1. Create a new loader in packages/cli/src/loaders/tmx.ts
2. Implement parsing logic for TMX XML structure
3. Add two unit tests in packages/cli/src/loaders/index.spec.ts:
   • Test parsing a simple TMX file
   • Test handling metadata in TMX entries
4. Update @replexica/spec to include TMX format
5. Generate a changeset using pnpm new for both 'replexica' and '@replexica/cli' packages
6. In the pull request, include a link to the TMX specification used.

After completing the task

Noticed a file format Replexica doesn't yet support? Please create a new GitHub ticket (if it doesn't yet exist!), using the format/structure of this GitHub issue.

[partik03]

@maxprilutskiy kindly this one to me

[vrcprl]

@partik03 assigned 🚀

[maxprilutskiy]

up for grabs again!