Expression type info

[ThakeeNathees]

Description

[mgtm98]

In this PR @ThakeeNathees is trying to get all the types from all expressions in mypy and populate them back to Jac.
I have some arch. changes as follow

• Make (AstSymbolNode::name_spec.sym_typ and Expr::expr_type) the same and this can be done through introduce a new AstTypedNode to be a common parent for Expr and AstSymbolNode

also note that this can only happen because of adding more types inside the ExpressionChecker visitors so that we can visit all the expressions and extract info from them. We need to review how all the visitor methods are created (dynamically created in run time) and we need to make sure that this won't degrade mypy

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✅ ThakeeNathees
❌ mgtm98

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