c7n.report - add raw output option

[ericforbes]

c7n.report - add raw output option

Description: This adds --format raw option to the c7n report command. Using this will spit out the JSON to standard out. This is useful when we want the raw JSON instead of CSV or some other filtered/sorted output.

[kapilt]

Thanks for the pull request. Rather than raw what do you think about 'json' as the name? i think we can simplify the date time removal via just using the std custodian json serializer which handles datetimes. One other question is this returning the actual raw records, or it it just the values that would normally be returned by csv etc formats, ie does --field stuff still apply or is it just the full dump of whatever is found in resources.json?

[kapilt]

rather than removing the records, we can just just utils.dumps which will do datetime serialization for json on datetime

[ericforbes]

This returns the raw JSON records with two added keys in the JSON objects: policy (policy name) and region.

I'm not familiar and cannot find anything docs about a Utils python class available? I can instead check for CustodianDate and then replace it with date.isoformat() instead of removing it.. thoughts?

[kapilt]

its a utility function we define in c7n, see from c7n.utils import dumps

[kapilt]

lgtm, the only question remaining is name it json or raw .. i kinda of favor json if only because its descriptive of what you'll get.. raw feels appropriate but is a little less descriptive of the output and concievably (or maybe not), some provider might actually have a different format, or we might allow blob encoding in a different format (bson, capnproto, zstd compress, etc).

[ericforbes]

Yes I agree here.. the format types (csv, grid, simple) describe the type of output, raw doesn't really make sense and JSON does here as it is clear to the user

[kapilt]

lgtm