Provide Gradle task to generate the THIRD-PARTY file

[dlvenable]

Is your feature request related to a problem? Please describe.

The THIRD-PARTY file Data Prepper currently has is difficult to maintain. Data Prepper should use automation to generate it.

Describe the solution you'd like

Add a Gradle task which will re-generate the THIRD-PARTY file. It should be run manually, and require a PR before updating the file in main.

The com.github.jk1.dependency-license-report Gradle plugin will generate a good format when using the TextReportRenderer render. Because Data Prepper is on Gradle 6.6, it must be the 1.x version.