Taboola: Support GPP

[ahmadlob]

In the page, it shows we partially supporting GPP
https://docs.prebid.org/dev-docs/bidders/taboola.html

However, it should be simply "true" according to the meta data file taboola.md

[bretg]

@ahmadlob - you need to make a docs pull request to update https://github.com/prebid/prebid.github.io/blob/master/dev-docs/bidders/taboola.md with the gpp_sids metadata.

From https://docs.prebid.org/dev-docs/bidder-adaptor.html

If you support the IAB’s GPP consent string, add gpp_sids with a comma separated list of section names, e.g. gpp_sids: tcfeu, tcfca, usnat, usstate_all, usp. Default is None.