move graphql logic into integration_test_lib

[QuiteStochastic]

https://app.zenhub.com/workspaces/velocity-62264fddc441a100183f7f86/issues/gh/minaprotocol/mina/13260

Previously, the only way for the test_executive to send graphql commands to nodes on the lucy testnet was to use the graphql functions in kubernetes_network.ml. However kubenetes_network.ml is within the package lib/integration_test_cloud_engine, which would make it inaccessible to any other hypothetical engine which we may want to develop, therefore the new engine would have to reimplement it all from scratch.

Therefore I have ported the graphql functions and surrounding logic from lib/integration_test_cloud_engine/kubernetes_network.ml to lib/integration_test_lib/graphql_requests.ml

It was a pretty direct port, the only real dependency was that the old functions required that the node be passed to them. That's really quite unnecessary, the functions only really need the Uri of the node, which is how the new functions work.

old:

val send_payment :
     logger:Logger.t
  -> t (* this is a Kubernetes_network.Node.t*)
  -> sender_pub_key:Signature_lib.Public_key.Compressed.t
  -> receiver_pub_key:Signature_lib.Public_key.Compressed.t
  -> amount:Currency.Amount.t
  -> fee:Currency.Fee.t
  -> signed_command_result Deferred.Or_error.t

new:

val send_payment :
     logger:Logger.t
  -> node_uri:Uri.t (* now we just pass in a common Uri.t type, which is a basic library type.  *)
  -> sender_pub_key:Signature_lib.Public_key.Compressed.t
  -> receiver_pub_key:Signature_lib.Public_key.Compressed.t
  -> amount:Currency.Amount.t
  -> fee:Currency.Fee.t
  -> signed_command_result Deferred.Or_error.t

[QuiteStochastic]

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[mrmr1993]

Lgtm but see nits

[QuiteStochastic]

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