[Feature] Add support for NVIDIA AI LLMs and embedding models

[deshraj]

Description

As the title suggests.

Type of change

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

[codecov]

Codecov Report

Attention: Patch coverage is 3.33333% with 58 lines in your changes are missing coverage. Please review.

Project coverage is 55.85%. Comparing base (09cdaff) to head (cc89480).
Report is 1 commits behind head on main.

Files	Patch %	Lines
embedchain/llm/nvidia.py	0.00%	37 Missing ⚠️
embedchain/embedder/nvidia.py	0.00%	19 Missing ⚠️
embedchain/config/base_app_config.py	50.00%	1 Missing ⚠️
embedchain/telemetry/posthog.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1293      +/-   ##
==========================================
- Coverage   56.41%   55.85%   -0.56%     
==========================================
  Files         151      153       +2     
  Lines        6122     6169      +47     
==========================================
- Hits         3454     3446       -8     
- Misses       2668     2723      +55     

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