Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

Signed-off-by: Fionn O'Donohoe <fionno@xilinx.com>

[Docker] Add specific version for markupsafe (python package that gets usually installed when installing jupyter)

this commit moves all git repo-based dep cloning to ouside Docker,
and their installation commands to the entrypoint script

Made QuantIdentityHandler and FoldQuantWeights compatible with DebugMarker nodes and added QONNX to the test_brevitas_debug test.