Convert action_logs.info to JSON

Action_logs does not give enough detail. This will help resolve this issue.

Koha Community Bug #15296

Goal: $6000

Raised: $0

Supporters: 0

Work to be done:

Convert action_logs.info to JSON

1) Mode code to store json in info column.

2) Database update to convert existing D::D info to JSON.

3) Add code to store diffs of changed patron in JSON in action_logs.info.

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