lightning: fix encode kvs size greater than 4.0g caused pebble panic (#1105)

[ti-chi-bot]

This is an automated cherry-pick of #1105

What problem does this PR solve?

panic: pebble: batch too large: >= 4.0 G

What is changed and how it works?

sends kv batch every 96k.

Check List

Tests

• Unit test
• Integration test

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release Note

• Fix the issue that lightning panic due to batch kv greater than 4.0g.

[glorv]

/lgtm

[Little-Wallace]

LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• Little-Wallace
• glorv

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[3pointer]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: c161255