Add _env_remote_transfer_keys field

This adds a new randomly-generated pair of (PublicKey, PrivateKey) to be
later used to send messages between instances.

It also:

* Returns a remote transfer pub key inside an AuthResponse
* Adds pubKey roundtrip test
4 jobs for adinapoli/issue-403 in 83 minutes and 35 seconds (queued for 20 minutes and 36 seconds)
Status Job ID Name Coverage
  Cabal
passed #16269
cabal

00:36:58

 
  Stack
passed #16270
stack

00:08:56

 
  Bench
manual #16271
allowed to fail manual
bench
 
  Test
failed #16272
test

00:37:40

 
Name Stage Failure
failed
test Test
calling stop core nlp - done
Test suite garg-test-hspec: FAIL
Test suite logged to:
/builds/gargantext/haskell-gargantext/dist-newstyle/build/x86_64-linux/ghc-9.4.8/gargantext-0.0.7.4.2/t/garg-test-hspec/opt/test/gargantext-0.0.7.4.2-garg-test-hspec.log
0 of 1 test suites (0 of 1 test cases) passed.
Error: cabal: Tests failed for test:garg-test-hspec from gargantext-0.0.7.4.2.

Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1