Context

Purpose of this MR is to introduce file structure for implementing instructions from different ISA extensions.

Decided to add impl blocks to HartState split in different files like M32_ext.rs / I64_ext.rs.

Manually testing the MR

Document the interface of any function added or modified (see the coding guidelines)
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Provide automatic testing (see the testing guide).
For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
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Edited Jan 22, 2024 by Felix Puscasu