Adds support for IN operator as adhoc filter

[Kenterfie]

This merge request adds a missing feature, which we have actively used in the past with the Altinity Grafana datasource. In general it allows adhoc filters which make use of the IN operator.

This issue is also addressed in #883

Example adhoc filter

key = ipv4Dst
operator = IN
value = ('1.1.1.xxx','2.2.2.xxx')

Expected additional filter
settings additional_table_filters={'table' : ' ipv4Dst IN (\'1.1.1.xxx\',\'2.2.2.xxx\')'}

Current additional filter output
settings additional_table_filters={'table' : ' ipv4Dst IN \'('1.1.1.xxx','2.2.2.xxx')\' '}

[CLAassistant]

All committers have signed the CLA.

[SpencerTorres]

Thanks for the contribution! Make sure to sign the CLA and add a CHANGELOG entry. Could you also edit your PR description to include a screenshot or example adhoc value for the IN operator? Is it comma separated or something else?

[SpencerTorres]

Few notes/questions

[aangelisc]

Thank you for the contribution @Kenterfie!

[Kenterfie]

Thanks for your fast reaction on that @aangelisc, but one question. I can find the change in the CHANGELOG.md, but can't find it in release 4.4.0? What happened to it?

[aangelisc]

Hi @Kenterfie, apologies this looks like it didn't make it into the 4.4.0 release but was mistakenly included in the CHANGELOG. It'll be out in the next release.