Use "GENERATED BY DEFAULT AS IDENTITY" for h2 2.0+

[nvoxland]

Description

Fixes #2362

Change H2 2.0's autoIncrement syntax from AUTO_INCREMENT GENERATED BY DEFAULT AS IDENTITY. Keep 1.x as-is

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Dev Handoff Notes (Internal Use)

Links

• Fixed Issue: Changeset generates wrong CREATE TABLE query for auto increment primary key column #2362
• Test Results: https://github.com/liquibase/liquibase/pull/2372/checks

Testing

• Steps to Reproduce: {LINK TO ISSUE OR "See above"}
• Guidance:
  • Impact: Only impacts h2. Creates separate logic for h2 1.x vs. 2.x

Dev Verification

Old AUTO_INCREMENT syntax worked for me with 2.0 even, but users reported issues with it. Checked that the new syntax works with my 2.0 setup through both manual and automated tests

┆Issue is synchronized with this Jira Bug by Unito