zif_peng_azoai_sdk/ dependency to aisdkforsapabap

[Ennowulff]

Syntax error in zcl_vdb_002_embedding_full because of zif_peng_azoai_sdk which is located in aisdkforsapabap

readme says "you might want to install this OpenAI ABAP SDK".

But it's obligatory.

[oisee]

@Ennowulff thank you - will review and revisit this dependency - might be better to use ZLLM: https://github.com/oisee/zllm