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feat: set billing customer credit min limit

- If a billing account credit min limit is set less then 0,
it works as overdraft. Default is 0.
- If a org billing account is in overdraft state, it's not
allowed to create new billing account unless the dues are
settled.
- Setting this limit more then 0 works as min purchase requirement
for the account.
- Only platform admins can change the account limits.
- https://github.com/raystack/proton/pull/370

Signed-off-by: Kush Sharma <thekushsharma@gmail.com>