Updates required for QAT

This MR includes:

• Abs operator;
• Hook system for Node (as suggested in #98 @thibaultallenet).
• Update of SinglePassGraphMatching to match no connection (with the special node keyword $).
• Solved some SinglePassGraphMatching issues and added more complex unit tests.
• Added missing inChannels() method for FC operator;
• Added matchFrom() method to SinglePassGraphMatching in order to match a query only for a specific starting node;
• Fix issue #87 (closed).

added Feature 🚀 label

assigned to @olivierbichler

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requested review from @pineapple

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• 4c0c51fc - Updated graph matching to match the absence of connection

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• c29f91f5 - Improved SinglePassGraphMatching

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• cf2414b4 - Fix for NVCC

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mentioned in issue #87 (closed)

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• 17d82ab3 - Fix warning

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• 200f0e43 - Use Log instead of print()

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• 0d6bad3b - Added inChannels() to FC op
• 498327e6 - Added matchFrom() to SinglePassGraphMatching

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marked this merge request as ready

I propose to merge this MR, which is independent of QAT implementation in aidge_quantization, as it solves several issues.