First big batch of instructions skeletons

[AFOliveira]

This PR has the instructions skeletons of the following extension:

• Zicfiss
• Zifencei
• H
• Zabha
• Zacas
• Zalasr
• Zawrs
• Zfbfmin
• Zicond

Q and D are also almost ready but I am modifying registers naming.

[AFOliveira]

Regression test passed locally, I might have added some folder by mistake, I'll try to fix it asap.

[dhower-qc]

In general, it seems that every skeleton sets data_independent_timing to true, correct? Could you change that to false? I think that will make it easier to get the correct list in later.

[AFOliveira]

@dhower-qc This is related to fence.i not having the parameter "variables", there was none on yours, but I guess now it's breaking the validation. Shall I add an empty "variables" field?

Parsing IDL code for RV64...done
Type checking IDL code for _64...

Instructions: |================================================================|

CSRs: |========================================================================|

Functions: |===================================================================|
/home/runner/work/riscv-unified-db/riscv-unified-db/lib/validate.rb:239:in `block in validate_instruction_encoding': undefined method `count' for nil:NilClass (NoMethodError)

        vars_match = variables.count { |variable| ary_from_location(variable["location"]).include?(i) }
                              ^^^^^^
	from /home/runner/work/riscv-unified-db/riscv-unified-db/lib/validate.rb:236:in `times'

[AFOliveira]

Everything should now be ready.

[dhower-qc]

Thanks!!