[feat] Support for LOCK-Statements

[ANeumann82]

This adds support for LOCK-Statements (Requested for example here #1142, but we also need it)

It supports:

• DB2: https://www.ibm.com/docs/en/db2/12.1.0?topic=statements-lock-table
• Most of Oracle: https://docs.oracle.com/en/database/oracle/oracle-database/23/sqlrf/LOCK-TABLE.html

I just saw that MySQL has a bit different syntax, but as I don't need it I wouldn't add it for now.

Please have a look and let me know if there's something missing or wrong.

[ANeumann82]

JMH-Run on my machine:

Benchmark                               (version)  Mode  Cnt    Score    Error  Units
JSQLParserBenchmark.parseSQLStatements     latest  avgt   15  158.130 ▒ 19.012  ms/op
JSQLParserBenchmark.parseSQLStatements        5.3  avgt   15  135.400 ▒ 14.585  ms/op
JSQLParserBenchmark.parseSQLStatements        5.1  avgt   15  110.471 ▒  9.734  ms/op

[manticore-projects]

Thank you much for your contribution!