[REFACTOR] StructInfo M2: Cleanups on legacy shape related items

Removes shape(), shape_
- Introduce ShapeOf(expr) to keep some of the shape of behavior. Note that in most cases, likely we want to look at struct info directly instead
Removes RuntimeDepShape (we can now use TensorStructInfo with shape=None to indicate no symbolic shape)
Consolidate and clean builder api: remove CanProveShapeEqual as it now sits in analysis, consolidate all binding emit API to EmitNormalized
Remove DeriveFuncShape as we now have better derivations through struct info
Remove all LegacyShapeHint related functions
Updated the testcases to make use of struct info checkings.
Remove DimType as it is not being used and we can use PrimType to store shape dimensions.

tlc-pack / relax