Compress Service Provider request

[Sgtpluck]

Relevant Ticket or Conversation:

https://cm-jira.usa.gov/browse/LG-10062

Description of Changes:

This ticket surfaced an issue where, when JSON requests are over 20k, they are automatically rejected by nginx. We raised the nginx threshold, but also would like to compress requests to make sure the requests stay below the threshold.

This ticket should be merged in AFTER 18F/identity-idp#9074

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