Remove VSA types from claripy.ast.bv

[twizmwazin]

Description

Currently, there are various VSA-related types in claripy/ast/bv.py. These should be moved to their own file. They include SI, TSI, ESI, ValueSet, VS, DSIS, as well as possibly a few of the ops that only make sense when a BV is actually a set type. As part of this, BV currently has a bunch of parameters that are specific to VSA, these should be a separate (possibly derived from BV) type.

Steps to reproduce the bug

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Environment

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Additional context

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