feat: add flag -exclude-analyzers

[ian-oneleet]

This adds a new flag, -exclude-analyzers, which excludes all Analyzer-based rules.

Alongside #1419, this makes it convenient to run a slightly slimmed-down, substantially faster version of Gosec. It's not very difficult to exclude these rules yourself, except:

• you have read the source code to know which rules to exclude
• for users who don't want to run SSA analysis, any Analyzer-based rules added in future updates to Gosec could lead to significant, unexpected performance regressions, if those users fail to add the new rules to the -exclude list