Welcome Back: yeahmobi

[SyntaxNode]

Reverting removal of the Yeahmobi adapter. This adapter was remove due to an unreachable email address. They've provided an updated email address which we've verified is actively monitored.

Per #3194 from @solinary06

[SyntaxNode]

Please review this PR only from the perspective of reverting the removal commit, updating the email address, and updating the adapter name to match current best practices. Reviews of the code itself is out of scope.

[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, 94d6581

yeahmobi

Refer here for heat map coverage report

github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:23:	Builder		100.0%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:35:	MakeRequests	100.0%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:46:	makeRequest	78.6%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:76:	transform	93.8%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:104:	getYeahmobiExt	100.0%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:127:	getEndpoint	100.0%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:132:	MakeBids	100.0%
github.com/prebid/prebid-server/adapters/yeahmobi/yeahmobi.go:170:	getBidType	100.0%
total:									(statements)	95.1%

[hhhjort]

LGTM