lightning: add session-vars to config file (#47414)

[ti-chi-bot]

This is an automated cherry-pick of #47414

What problem does this PR solve?

Issue Number: close #47305

Problem Summary:

What is changed and how it works?

expose existing fields when TOML marshal/unmarshal

Check List

Tests

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

  • I checked and no code files have been changed.

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.

None

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

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[lance6716]

/test pull-br-integration-test

[tiprow]

@lance6716: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test pull-br-integration-test

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@6907b47). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #47500   +/-   ##
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  Coverage               ?   73.6732%           
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  Files                  ?       1085           
  Lines                  ?     348402           
  Branches               ?          0           
================================================
  Hits                   ?     256679           
  Misses                 ?      75258           
  Partials               ?      16465           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lance6716

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• OWNERS [lance6716]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-10 08:04:24.6267916 +0000 UTC m=+1125862.213901737: ☑️ agreed by lance6716.

[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/unit-test	0a4c56b	link	true	/test unit-test

Full PR test history. Your PR dashboard.

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