Design ProxySettingsPolicy API

[ciarams87]

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As a user of NGF I want a design to configure NGINX's proxy buffer configuration for my applications through the use of ProxySettingsPolicy So that I can implement the ProxySettingsPolicy CRD

Design should account for:

• NGINX directives:
  • proxy_buffer_size
  • proxy_buffers
  • proxy_buffering
  • proxy_busy_buffers_size

And be extensible to support further proxy_* directives later

• The NGINX Extensions design is reviewed to implement the above directives.
• The above directives are configurable via a ProxySettingsPolicy for the scope it is applied at.
• The ProxySettingsPolicy can be attached to a Gateway or Route.

Acceptance: An enhancement proposal is created for the design