refactor: rename ConnectorSchema/SourceSchema to FormatEncode

[xxchan]

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What's changed and what's your intention?

"connector schema" is confusing. "format encode" is more easy to understand.

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[xxchan]

• refactor(meta): generalize replace table to replace job #18935
• refactor(meta): simplify stream job table/source id assignment #19171
• refactor: rename ConnectorSchema/SourceSchema to FormatEncode #19174 👈
• main

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