Generate view source code with generated views

[lukaseder]

Generated code should include the source code of views now that we have API for this content via TableOptions (#9799). In a first step, the source code will be in string form, as plain SQL. If we can parse it, we'll make a parse call.

Since there may be compilation or parser errors when such source code is being generated, we have to introduce this feature with a new guard flag: <sourcesOnViews/> in configuration/generator/generate/sourcesOnViews.

The sources will be made available through jOOQ-meta API via Definition.getSource() (see #9816)

Dialects for which this will be supported:

• CockroachDB
• DB2
• Derby
• Firebird
• H2 (requires support for ignoring the FORCE keyword in CREATE FORCE VIEW, in the parser: Various parser bugs / missing features #8452)
• HSQLDB
• Informix
• MariaDB
• MySQL
• Oracle
• PostgreSQL
• SQLite
• SQL Server
• XMLDatabase (implemented separately, through Add support for INFORMATION_SCHEMA.VIEWS in jooq-meta.xsd #9819)