UOE-12550: Adding placementid support for Nativo

[pm-isha-bharti]

Description

Please add change description or link to ticket, docs, etc.

Checklist:

• PR commit list is unique (rebase/pull with the origin branch to keep master clean).
• JIRA number is added in the PR title and the commit message.
• Updated the header-bidding repo with appropiate commit id.
• Documented the new changes.

For Prebid upgrade, refer: https://inside.pubmatic.com:8443/confluence/display/Products/Prebid-server+upgrade

[github-actions]

Code coverage summary

Note:

• Prebid team doesn't anticipate tests covering code paths that might result in marshal and unmarshal errors
• Coverage summary encompasses all commits leading up to the latest one, 6991ccd

nativo

Refer here for heat map coverage report

github.com/PubMatic-OpenWrap/prebid-server/v3/adapters/nativo/nativo.go:27:	Builder			100.0%
github.com/PubMatic-OpenWrap/prebid-server/v3/adapters/nativo/nativo.go:34:	MakeRequests		83.3%
github.com/PubMatic-OpenWrap/prebid-server/v3/adapters/nativo/nativo.go:84:	MakeBids		94.4%
github.com/PubMatic-OpenWrap/prebid-server/v3/adapters/nativo/nativo.go:121:	getMediaTypeForImp	100.0%
total:										(statements)		91.5%