Add StatsNegate Support

[jdumalaonITRS]

This commit adds StateNegate functionality which follows the Negate implementation. It also fixes an issue where Negate/StatsNegate is not applied on the GroupOperator level which is supported in Livestatus

[sni]

thanks, looks good so far. Could you have a look at the ci tests please?

[jdumalaonITRS]

Thanks. Yup I will work on the failing ci tests.

[sni]

btw, you can run the citests locally my "make citest" or "make golangci" if you only want to run the golangci checks.

[jdumalaonITRS]

Yup just saw it now. I will do so

[sni]

i will have a look at those failed citest now, it seems unrelated to your changes.

[jdumalaonITRS]

ok thanks!

[sni]

should be fine now, but somehow i cannot rebase this PR.

[jdumalaonITRS]

thanks. No worries. I rebased the changes

[sni]

thanks, looks fine.