New Adapter: TRUSTX (remove Grid alias)

[trustXops]

Docs PR: prebid/prebid.github.io#6355

[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, 6e452fe

trustx

Refer here for heat map coverage report

github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:50:	Builder		100.0%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:57:	MakeRequests	81.8%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:82:	MakeBids	100.0%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:116:	setImpExtData	87.5%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:130:	getHeaders	100.0%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:162:	getTypedBid	100.0%
github.com/prebid/prebid-server/v3/adapters/trustx/trustx.go:193:	getBidMeta	100.0%
total:									(statements)	96.2%