Sanitize null bytes

[tsg]

Description

This adds a new processor that can remove NULLs before writing to the target db. See #778

Related Issue(s)

• Closes Fix JSONB string scalar serialization #744

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

Changes Made

• Add ne wprocessor
• Add new config var

Checklist

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

Additional Notes

[github-actions]

Merging this branch changes the coverage (1 decrease, 2 increase)

Impacted Packages	Coverage Δ	🤖
github.com/xataio/pgstream/cmd/config	84.17% (+0.10%)	👍
github.com/xataio/pgstream/pkg/stream	35.78% (-0.18%)	👎
github.com/xataio/pgstream/pkg/wal/processor/sanitizer	88.89% (+88.89%)	🌟

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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	90.39% (+0.08%)	229 (+2)	207 (+2)	22	👍
github.com/xataio/pgstream/cmd/config/config_yaml.go	89.06% (+0.06%)	192 (+1)	171 (+1)	21	👍
github.com/xataio/pgstream/pkg/stream/config.go	69.44% (ø)	36	25	11
github.com/xataio/pgstream/pkg/stream/stream.go	0.00% (ø)	129 (+3)	0	129 (+3)
github.com/xataio/pgstream/pkg/wal/processor/sanitizer/wal_sanitizer.go	88.89% (+88.89%)	27 (+27)	24 (+24)	3 (+3)	🌟

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/wal/processor/sanitizer/wal_sanitizer_test.go