Document Java System Properties

[Amemeda]

Documenting Java System Properties in ConfigurationDocGen.java:

• New section for Java System Properties added into the server properties documentation
• New method Property.getSystemProperties() was added for use by ConfigurationDocGen.java.
• The compression algorithm System Properties classes were updated to move the property name into a constant to be grabbed easier by Property.java.getSystemProperties().

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The following properties were identified to be System Properties, and are included in this new documentation:

• CODEC_BZIP2: io.compression.codec.bzip2.class (new constant)
• CODEC_LZ4: io.compression.codec.lz4.class (new constant)
• CODEC_LZO io.compression.codec.lzo.class (new constant)
• CODEC_SNAPPY: io.compression.codec.snappy.class (new constant)
• CODEC_ZSTANDARD: io.compression.codec.zstd.class (new constant)
• ACCUMULO_PROPERTIES_PROPERTY: accumulo.properties
• DEBUG_HOST: org.apache.accumulo.client.rpc.debug.host

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server-properties.md with the new System Properties section:

This pr closes #4935

[Amemeda]

@dlmarion Could I get your opinion on my output/format of the System Properties? The section is at the very bottom of server-properties.md, proper descriptions still need to be added