Determine when table properties have been set or modified

[ddanielr]

Is your feature request related to a problem? Please describe.
Setting table properties via the accumulo.properties file is deprecated in 2.1 and then removed in main.

While there is an API to set table properties, there is nothing to denote when a property was set, changed, or removed in ZK.

The lack of transaction details makes it difficult to manage properties for an accumulo deployment.

Describe the solution you'd like
accumulo properties that are set in ZK should also have metadata that can contains creation time and last modified time.

This would improve configuration management processes.

Describe alternatives you've considered
Having a way for users to include system or namespace specific properties via the accumulo init command
would also help for initial system creation

That would be similar to the NewTableConfiguration type that allows properties to be set on table creation.

Additional context

Other issues and PRs related to setting properties:
#5854
#5855
#5562
#3909
#5859

[ddanielr]

Additional Info:

The root and metadata configs are added as part of the FileSystemInitializer but only contain properties from the InitialConfiguration class

accumulo/server/base/src/main/java/org/apache/accumulo/server/init/FileSystemInitializer.java

Lines 160 to 166 in 88abe22

	private void initSystemTablesConfig(final ServerContext context)
	throws IOException, InterruptedException, KeeperException {
	setTableProperties(context, RootTable.ID, initConfig.getRootTableConf());
	setTableProperties(context, RootTable.ID, initConfig.getRootMetaConf());
	setTableProperties(context, MetadataTable.ID, initConfig.getRootMetaConf());
	setTableProperties(context, MetadataTable.ID, initConfig.getMetaTableConf());
	setTableProperties(context, REPL_TABLE_ID, initConfig.getReplTableConf());

Any additional properties set in the accumulo.properties file are uploaded on initialize (or skipped if not valid).

accumulo/server/base/src/main/java/org/apache/accumulo/server/init/Initialize.java

Lines 197 to 210 in a8dd117

	private void checkUploadProps(ServerContext context, InitialConfiguration initConfig, Opts opts) {
	if (opts.uploadAccumuloProps) {
	log.info("Uploading properties in accumulo.properties to Zookeeper."
	+ " Properties that cannot be set in Zookeeper will be skipped:");
	Map<String,String> entries = new TreeMap<>();
	initConfig.getProperties(entries, x -> true, false);
	for (Map.Entry<String,String> entry : entries.entrySet()) {
	String key = entry.getKey();
	String value = entry.getValue();
	if (Property.isValidZooPropertyKey(key)) {
	SystemPropUtil.setSystemProperty(context, key, value);
	log.info("Uploaded - {} = {}", key, Property.isSensitive(key) ? "<hidden>" : value);
	} else {
	log.info("Skipped - {} = {}", key, Property.isSensitive(key) ? "<hidden>" : value);