Support case insensitive bidder name in ext.prebid.data.eidpermissions.bidders

[onkarvhanumante]

PR makes changes to support case insensitive bidder names in ext.prebid.data.eidpermissions.bidders.

As shown below bidder name appnexus is known name to PBS. But APPNEXUS is unknown. Prior to PR changes PBS would have error out with unknown APPNEXUS bidder name messgae. PR has implemented insensitive bidder name comparison in ext.prebid.data.eidpermissions.bidders

        "ext": {
            "prebid": {
                "data": {
                    "eidpermissions": [
                        {
                            "source": "source1",
                            "bidders": [
                                "APPNEXUS" //  sensitive bidder name
                            ]
                        }
                    ]
                }
          }

The base branch was changed.

[onkarvhanumante]

Closing this PR because commit got messed up after base branch PBS-1254-1 was deleted.

New PR - #3141