vote: disable votepool when bsc protocol not enabled

[NathanBSC]

Description

disable votepool when bsc protocol not enabled

Rationale

we need a emergency handler when chain stopped after plato upgrade,

set flag disablebscprotocol will disable vote propagation, so most parts of fast finality have been disabled,

but votpool will still be constructed.

In this PR, we disable votepool when bsc protocol not enabled, so we can use flag disablebscprotocol to remove

fast finality much more clean

Example

add an example CLI or API response...

Changes

Notable changes:

• add each change in a bullet point here
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