`aws.billing` template schema-b

[endorama]

Adds aws.billing schema-b template and config.

See https://github.com/elastic/elastic-integration-corpus-generator-tool/pull/43#issuecomment-1410470148

[elasticmachine]

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#### Build stats * Start Time: 2023-03-06T11:09:25.780+0000 * Duration: 3 min 47 sec #### Test stats :test_tube: | Test | Results | | ------------ | :-----------------------------: | | Failed | 0 | | Passed | 65 | | Skipped | 0 | | Total | 65 |

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[endorama]

@aspacca may you please have a look at the fields definition? In this template I need to generate timestamps in ISO8601 and SYSLOG formats (see integrations ingest pipeline).

I opened #44 to track this discussion, as digging a bit deeper it may be easy to achieve but requires discussing the possible trade offs.

[endorama]

/test/

[endorama]

I'm sorry I completely messed up this PR. The title is for aws.ec2_logs, I started adding schema-a for it them did schema-b for aws.billing.

I then removed schema-a for ec2_logs, so this PR contains schema-b for aws.billing. As there have been an extensive review, I renamed this to aws.billing. Sorry for this confusion :(

[aspacca]

just a minor comment, @endorama

[endorama]

@aspacca I added an helper function for AWS AZs in a9328bd (#43), I find this approach more streamlined and easy to use, let me know what you think.

[aspacca]

👍 good to merge for me