lightning: support latin1 source file encoding

[lance6716]

What problem does this PR solve?

Issue Number: close #44434

Problem Summary:

What is changed and how it works?

as title

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

lightning support loading source files encoded in latin1 character set

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[GMHDBJD]

LGTM

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, GMHDBJD, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-06 07:55:18.037889325 +0000 UTC m=+334904.310862109: ☑️ agreed by GMHDBJD.
• 2023-06-06 07:56:34.243480848 +0000 UTC m=+334980.516453629: ☑️ agreed by hawkingrei.