What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind feature

What does this PR do / why do we need it:

This PR is to move EmbeddingLookup internal.
Which issue(s) this PR fixes:

Fixes #I1KR9Q:[Auto parallel] EmbeddingLookup should be internal

Special notes for your reviewers: