Jina AI Integration - Githubissues

Summary and motivation

Add the Jina AI embedding functionality to Haystack

If the request is accepted, ensure the following checklist is complete before closing this issue.

[x] The code was merged in the main branch
[x] Docs are published at https://docs.haystack.deepset.ai/
[x] There is a Github workflow running the tests for the integration nightly and at every PR
[x] A label named like integration:<your integration name> has been added to this repo
[x] The labeler.yml file has been updated
[x] The package has been released on PyPI
[x] An integration tile has been added to https://github.com/deepset-ai/haystack-integrations
[x] The integration has been listed in the Inventory section of this repo README
[x] https://github.com/deepset-ai/devrel-board/issues/232
[x] The feature was announced through social media