Add option for ignoring processing errors

[tsg]

Description

This adds two config options for the snapshot configuration:

• ignore_row_processing_errors (PGSTREAM_POSTGRES_SNAPSHOT_IGNORE_ROW_PROCESSING_ERRORS) - if set to true, it will continue the snapshot in case there are errors on a particular row / batch.
• log_row_on_error" (PGSTREAM_POSTGRES_SNAPSHOT_LOG_ROW_ON_ERROR`) - if set to true, it will log the row (including user data) before continuing / exiting.

Both of these options are meant for troubleshooting and should be used with care in production environments:

• Ignoring errors can result in consistency issues, so while the immediate error is ignored, foreign-key or other constraints might fail later in the process.
• Logging the user data might leak PII into the logs.

Type of Change

Please select the relevant option(s):

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🔧 Refactoring (no functional changes)
• ⚡ Performance improvement
• 🧪 Test coverage improvement
• 🔨 Build/CI changes
• 🧹 Code cleanup

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Checklist

• Code follows project style guidelines
• Self-review completed
• Code is well-commented
• Documentation updated where necessary

[github-actions]

Merging this branch will increase overall coverage

Impacted Packages	Coverage Δ	🤖
github.com/xataio/pgstream/cmd/config	83.45% (+0.15%)	👍
github.com/xataio/pgstream/pkg/snapshot/generator/postgres/data	80.95% (+1.03%)	👍

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Coverage by file

Changed files (no unit tests)

Changed File	Coverage Δ	Total	Covered	Missed	🤖
github.com/xataio/pgstream/cmd/config/config_env.go	89.00% (+0.11%)	200 (+2)	178 (+2)	22	👍
github.com/xataio/pgstream/cmd/config/config_yaml.go	89.25% (+0.12%)	186 (+2)	166 (+2)	20	👍
github.com/xataio/pgstream/pkg/snapshot/generator/postgres/data/config.go	0.00% (ø)	12	0	12
github.com/xataio/pgstream/pkg/snapshot/generator/postgres/data/pg_snapshot_generator.go	86.44% (+0.91%)	236 (+8)	204 (+9)	32 (-1)	👍

Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code.

Changed unit test files

• github.com/xataio/pgstream/pkg/snapshot/generator/postgres/data/pg_snapshot_generator_test.go