Add GCS input to Akamai

[ShourieG]

Type of change

• Enhancement

What does this PR do?

Adds support for GCS input to the Akamai package.

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.

Related issues

• Closes [GCS Input] Add GCS to Cloudflare and Akamai #4291

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Build stats

• Start Time: 2022-11-30T08:56:01.270+0000

• Duration: 14 min 22 sec

Test stats 🧪

Test	Results
Failed	0
Passed	6
Skipped	0
Total	6

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚
Classes	100.0% (1/1)	💚
Methods	100.0% (20/20)	💚 4.608
Lines	93.229% (358/384)	👎 -0.121
Conditionals	100.0% (0/0)	💚

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Package akamai - 2.3.0 containing this change is available at https://epr.elastic.co/search?package=akamai