fix issue 2288: add --rules=+generate-label-prefix=prefix:A_ to change the style_regex

[ddppt-yy]

in issues #2288,
I proposed making the generate labels parameterized. Presumably, everyone was too busy to optimize this issue, so I have attempted to fix the problem.

In this issue, you also agreed that this was a good idea.

Currently, g_ remains the default option, but users can customize it.
For example:
verible-verilog-lint --rules=+generate-label-prefix=prefix:A_ ./sv.sv

Fixes #2288

[linux-foundation-easycla]

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• ✅ login: ddppt-yy / name: r0se (8ae20cd)

[hzeller]

Thanks for your contribution.
Can you have a look at the test failures ?

[ddppt-yy]

Thanks for your contribution. Can you have a look at the test failures ?

ok i will do it.