Add perception encoder workflow blocks

[hansent]

Description

• add perception encoder embedding model block for workflows
• extend InferenceHTTPClient with embedding endpoints
• register the new block in the workflow loader
• document usage of the perception encoder embedding block
• add unit tests and integration tests for perception encoder embedding

Type of change

• New feature (non-breaking change which adds functionality)

How has this change been tested, please provide a testcase or example of how you tested the change?

locally (with the download weights speedup branch also included..otherwise taking way to long to download the weights)

Any specific deployment considerations

n/a

Docs

• Docs updated? What were the changes: Doc changes to be pulled from the manifest.