Jcb/tm38 rename instr infix

Description

This commit renames the Value types in Untyped and Typed and Instr

Changes are:

• Renaming CVal and Val to CValue and Value'
• type Typed.Value = Value' Instr
• type Untyped.Value = Value' Op
• type Contract = Contract' Op
• Changed Instr to infix :+>

Related issue(s)

https://issues.serokell.io/issue/TM-38

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