User entered charge per kWh

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/user-entered-charge-per-kwh/
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Since the tesla database for charging costs is changing and difficult for ABRP to keep updated, let each user enter a cost per kWh globally with the ability to edit individual charges as needed. That way you get a reasonable estimate of costs.