tests(cucumber): add certification

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b38e545c...364282e5 - 44 commits from branch master
4b4578e5 - fix(cucumber) typo in readme
22601445 - feat(cucumber) subject agreement
c0b78efd - feat(cucumber) cert
2e3f12ec - fix(cucumber) clippy and contributing
0a51f1d4 - doc(cucumber) timeout and caps
1fff64de - wip(cucumber) fix broken rebase
59a11afd - wip(cucumber) change genesis state

@librelois I rebased my branch on master and the certification feature fails with:

Feature: Certification
  Scenario: Dave certifies Alice
   ✘  When dave certifies alice
      Step failed: /home/hugo/dev/duniter-v2s/end2end-tests/cucumber-features/certification.feature:6:9
      Captured output: 
      Step panicked. Captured output: Rpc error: JSON-RPC request error: "{\"jsonrpc\":\"2.0\",\"error\":{\"code\":1010,\"message\":\"Invalid Transaction\",\"data\":\"Inability to pay some fees (e.g. account balance too low)\"},\"id\":5}"

I'm using the wot.json genesis where Dave has 10ĞD which should be enough to pay the transaction fees. So I do not know if this test is supposed to fail.

I'm planning to add new certification scenarios where I test these fees / existential deposit cases.

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Also sometimes I get

Feature: Balance transfer
   ✘  Scenario's Before hook failed ./cucumber-features/account_creation.feature:3:3
      Captured output: fail to connect to node: Rpc(Transport(Connection timeout exceeded: 10s))

I'm using DUNITER_END2END_TESTS_SPAWN_NODE_TIMEOUT=60 because otherwise I reach spawn timeout. But this one is different.