case sensitivity of headers should not matter about gaxios HOT 3 OPEN

@JustinBeckwith a warning might be enough, but I think a cleaning step that lowercases headers would be good, that way upstream libraries that build on top of gaxios, e.g., google-auth-library need not check every combination of a given header.

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Headers are case-insensitive according to RFC2616 so this is a bug, not a feature request, in my opinion.

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I'm not sure what the actual bug is here :) Can someone give me an example? Right now the request.Headers field is just a POJO.

For example:

const options: GaxiosOptions = { 
  headers: {
    'content-type': 'application/json',
    'Content-Type': 'text/xml',
  },
},

We could look for this situation and throw if we find duplicate keys once lower cased?

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