SupplyChain object support in Prebid

[pm-harshad-mane]

Type of change

• Feature
• Code style update (formatting, local variables)

Description of change

• Supply chain object support in Prebid Proposal: Add support for passing SupplyChain Object to all bidders #3870 adapterManager will validate the schain object and will pass it to bidders/adapters only if it is valid, thus bidders/adapters will not require to validate schain object.
• schain param support in PubMatic adapter
• other minor changes in PubMatic adapter for better readability

             pbjs.setConfig({
                    "schain": {
                        "ver":"1.0",
                        "complete": 1,
                        "nodes": [
                            {
                                "asi":"indirectseller.com",
                                "sid":"00001",
                                "hp":1
                            }
                        ]     
                    }
                });

[pm-harshad-mane]

Hello @jsnellbaker , @bretg
Could you please review the code?

[pm-harshad-mane]

Please do not merge these changes as QA is pending.

[pm-harshad-mane]

Hello @bretg , @jaiminpanchal27
Can you please help me find why CI job is failing, I checked the logs but I am clueless to find a root-cause.

[pm-harshad-mane]

Thanks @jaiminpanchal27 , CI worked 👍