feat: add SSE updates for pair liquidity if requested

[dib542]

This PR update:

• abstracts out the long-polling mechanism for usage in any endpoint through use of route handlers:
  • getData: to get the relevant data for the endpoint, route parameters, and query parameters given
  • getPaginatedResponse: to format the data into pages of output payload for the given query parameters
  • it should format pages based on given pagination query parameters (eg. pagination.limit=100)
• adds an additional mechanism: "server-side events" or SSE for a more efficient method of data updates (when supported by the networking transport layer (using HTTP/2), and requested specifically from the using the query parameter streaming=true
  • see: https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events
  • adds optional HTTPS server usage (to enable HTTP/2) if the following environment vars are added:
  • SSL_PRIVATE_KEY_FILE: file path of the private PEM key
  • SSL_PUBLIC_KEY_FILE: file path of the public PEM key or
  • SSL_PRIVATE_KEY: the text of the private PEM key
  • SSL_PUBLIC_KEY: the text of the public PEM key