Correct missing underscores in ISA regex

Signed-off-by: Sergi Soler <109603773+ssoler-smd@users.noreply.github.com>

isa string checks for crypto fixed

fix Z extension names from K-Crypto Spec in the isa regex

Also fixed ordering of the Z extensions as per isa spec.

new isa-validation api

This is particularly helpful when other tools require to validate a n ISA string alone. These tools can now import `riscv_config.isa_validator` and call the `get_extension_list` to check  for errors and also return a list of all extensions present in the ISA string.

Significant change here is moving the regex from the schema to the constants file which can now be easily imported without having to load the schema yaml.

add support for zicbo* extensions

fix for index-based dependency checks in warl string.

Documentation Fix.

clean up warl and svnapot support added

- gitignore updated to ignore python-version files