able to set proxy agent to cognito http client

[richardzcode]

Be able to set "agent" property to cognito http client.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #724 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #724   +/-   ##
======================================
  Coverage    86.6%   86.6%           
======================================
  Files          74      74           
  Lines        3538    3538           
  Branches      674     674           
======================================
  Hits         3064    3064           
  Misses        456     456           
  Partials       18      18

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[yuntuowang]

Look good to me.

[powerful23]

👍 By the way, should we put this change in the doc?

[elorzafe]

@powerful23 what do you think?

[elorzafe]

I think this should be the opposite way, this.options should be at the end

[powerful23]

Agree

[powerful23]

@richardzcode can you make the change mentioned above and resolve the conflicts so we can merge this into the repo? Thanks.

[elorzafe]

@powerful23 what should we do with this pr?

[powerful23]

@richardzcode I am going to close this pr now. If you want to continue merging this, please reopen it.

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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