View change: Support for checking if validators belongs to the same key.

[Frozen]

Support for checking if validators belongs to the same key.
Leader Rotation based on getLeaderPubKey which is different for each iteration, while the view change it stays the same all time, that's why it requires additional actions for leader selection.

Based on feature IsLeaderRotationV2Epoch applies method getNextLeaderKeySkipSameAddress.

• Quorum: removed unsed argument

[sophoah]

@Frozen can you help rebase and fix conflict here.

[sophoah]

@Frozen can you rebase this one with the latest dev ?

[sophoah]

@Frozen I tested killing the external validator node to test view change in two scenarios: make multi-bls-key and make-multi-bls-key-multi-extl-node (#4819)

Both fails to even recover from view change. Networks is basically down when view change kick off when the external leader fails to propose

for the test ps aux | grep 9008 in both scenario will give you the external leader PID to kill (kill -9 pid)

cc @mur-me