python : add check-requirements.sh and GitHub workflow (#4585)

* python: add check-requirements.sh and GitHub workflow

This script and workflow forces package versions to remain compatible
across all convert*.py scripts, while allowing secondary convert scripts
to import dependencies not wanted in convert.py.

* Move requirements into ./requirements

* Fail on "==" being used for package requirements (but can be suppressed)

* Enforce "compatible release" syntax instead of ==

* Update workflow

* Add upper version bound for transformers and protobuf

* improve check-requirements.sh

* small syntax change

* don't remove venvs if nocleanup is passed

* See if this fixes docker workflow

* Move check-requirements.sh into ./scripts/

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Co-authored-by: Jared Van Bortel <jared@nomic.ai>

requirements/requirements-convert-hf-to-gguf.txt

@@ -0,0 +1,2 @@
+-r ./requirements-convert.txt
+torch~=2.1.1

requirements/requirements-convert-llama-ggml-to-gguf.txt

@@ -0,0 +1 @@
+-r ./requirements-convert.txt

requirements/requirements-convert-lora-to-ggml.txt

@@ -0,0 +1,2 @@
+-r ./requirements-convert.txt
+torch~=2.1.1

requirements/requirements-convert-persimmon-to-gguf.txt

@@ -0,0 +1,2 @@
+-r ./requirements-convert.txt
+torch~=2.1.1

requirements/requirements-convert.txt

@@ -0,0 +1,5 @@
+numpy~=1.24.4
+sentencepiece~=0.1.98
+transformers>=4.35.2,<5.0.0
+gguf>=0.1.0
+protobuf>=4.21.0,<5.0.0