[awsfirehose] Add support for routing api gateway logs

[kaiyan-sheng]

What does this PR do?

This PR adds routing rules for API gateway access logs.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2023-09-12T14:40:51.290+0000

• Duration: 14 min 29 sec

Test stats 🧪

Test	Results
Failed	0
Passed	9
Skipped	0
Total	9

🤖 GitHub comments

Expand to view the GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	60.0% (3/5)	👎 -40.0
Lines	100.0% (79/79)	💚 0.82
Conditionals	100.0% (0/0)	💚

[zmoog]

LGTM, but I would add a comment to give our future selves why the big if is there.

[lucian-ioan]

LGTM

[elasticmachine]

Package awsfirehose - 0.2.0 containing this change is available at https://epr.elastic.co/search?package=awsfirehose