Remove tfl.reshape op when possible

Remove tfl.reshape for the following two cases:

1. A tfl.reshape's input is from another tfl.reshape.
   Then these two tfl.reshape ops can be merged.

2. A tfl.reshape's result type is the same as its input type.
   This tfl.reshape op does nothing, which can be removed.

These transformations are put in a new source file, Canonicalizer.cpp,
because they are TFLite op to TFLite op transformations, and aiming
to making TFLite ops more canonicalized.

Also added a hasCanonicalizationPatterns marker in TableGen Op class
to indicate whether an op has custom getCanonicalizationPatterns().

PiperOrigin-RevId: 223806921