Add basic ga tag w/ settable campaignid

[scbedd]

Alrighty, I think this was about the cleanest as I could find to do this.

1. Add new header template that adds GA tag.
   • This header was generated by docfx template export default -> add my stuff -> copy into partials folder.
2. Add campaignId argument to GenerateDocFxToCConfig (which is really the function that builds the skeleton of the site)
   • This will optionally inject a specific campaignId if presented

Have run a test using the java folks as a guinea pig. To take advantage of this, merely update the call in Language-Settings.ps1 -> Get-<language>-GithubIODocIndex()

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[scbedd]

Going to do a couple template releases, then just merge this. It's a fairly transparent update.

[weshaggard]

Looks reasonable. Did you plan to also add GA support to the azure-sdk github.io site?

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[scbedd]

/check-enforcer override