[ML] Adding text embedding byte representation

[jonathan-buttner]

This PR adds the text embedding byte representation. This is to resolve the problems with the original PR: #2398 which caused the client generates to fail because it was unable to deduce the response format.

These changes coincide with the server changes here: elastic/elasticsearch#105290

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
inference.delete_model	⚪	Missing test	Missing test
inference.get_model	🔴	1/1	0/1
inference.inference	⚪	Missing test	Missing test
inference.put_model	⚪	Missing test	Missing test

You can validate these APIs yourself by using the make validate target.

[Anaethelion]

LGTM

[davidkyle]

LGTM