Add license to shaded jar file

[dkovalenkoI]

Summary:
Add license used in the JDBC driver to the shaded jar

Description:

• The license file needs to be under jdbc/src/main/resources/META-INF so it could be included in the shaded jar automatically when jar is built.
• Copy THIRD-PARTY-LICENSES.txt to jdbc/src/main/resources/META-INF in pom.xml when mvn build starts
• Add jdbc/src/main/resources/META-INF/THIRD-PARTY-LICENSES.txt to .gitignore to avoid it to be added to git repo as it is only for build purpose.

Test:

• Run jar -xf amazon-timestream-jdbc-2.0.0-shaded.jar to extract. TheTHIRD-PARTY-LICENSES.txt could be found under directory META-INF.
• Test the shaded jar using DbVisualizer, the JDBC connection creation and queries could run successfully.

Issue:
issues-37