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feat: add jsonlog support for pgbadger configuration

Add support for PostgreSQL's jsonlog format in pgbadger configuration,
with automatic selection as default for PostgreSQL 15 and later
versions. The jsonlog format provides structured JSON logging which
is better suited for modern log analysis tools.

Changes include:
- Add jsonlog option to log configuration formats
- Auto-select jsonlog as default for PostgreSQL >= 15
- Maintain backward compatibility with older versions (stderr default)
- Update API and CLI documentation to reflect new option
- Allow explicit format override via query parameter or flag

Signed-off-by: Sebastian Webber <sebastian@swebber.me>