Performance Improvement: high-requency listener

[RedstoneFuture]

Overview

As we know, the BlockPhysicsEvent is called very often, while not everyone needs the associated settings or flags.

With this PR I would like to outsource two high-frequency event-listeners to a separate class that can be explicitly deactivated in the settings.yml.

Description

1. Adding high-frequency-listener setting (same setting names as the setting in WorldGuard):

# The activity of high-frequency event listener can be deactivated here to improve the server performance. 
# Affected settings: 'redstone' settings here below. Affected flags: 'disable-physics', 'redstone'. 
# Only deactivate this setting if you do not need any of the mentioned settings or flags.
high-frequency-listener: true

2. Moving onRedstoneEvent(BlockRedstoneEvent event) and onPhysicsEvent(BlockPhysicsEvent event) from BlockEventListener.java to HighFreqBlockEventListener.java.

Performance Comparison

high-frequency-listener=true

= default value; behavior as before

high-frequency-listener=false

= after deactivation of the high-frequency flags

Test circuit

http://redstoneworld.de/downloads/intern/plugins/laggy_adder.zip

Note: It should be noted that the "/tps" command from Spigot still needs some time after the server start for the value to level out, as it is rounded here.

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### Submitter Checklist
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