Add support to have a field with string: string[], useful for examples to store roles

[deepakprabhakara]

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[deepakprabhakara]

Maybe we could just ask users to repurpose fields (key, value of type string/string) and stringify the array instead of introducing another attribute that supports arrays as value. Changing fields is tricky because we use it for calculating the digest of the log.

[deepakprabhakara]

We are getting requests to store custom attributes but with indexing. So might be a good idea to add a new attribute (similar to fields) but that gets indexed and supports string and array of strings.

[deepakprabhakara]

comma separated values in fields are tokenised and indexed now so we don't need to support arrays as a special case.