Resolve complex array types

[jogrogan]

Made various changes:

• Added nullability component into our AvroConverter to make the RelDataType we generate work with the JDBC schema conversion happening in Calcite.
• Added flink configs to the status of the SqlJob to be able to determine if a resource diverged based on its config and needs to be redeployed
• Added ability into ConfigService to only load expansion fields. This is needed by Flink to only get the properties under flink.config
  • Added ability to load these properties into the Job template
• Added the ability to flatten complex arrays into the sum of its parts and the ability to unflatten it back into a complex array
• Fix various checkstyle complaints

[ryannedolan]

nice