akamai: add event limit parameter to HTTPJSON stream

[efd6]

What does this PR do?

Adds an event limit parameter to the HTTPJSON stream.

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.

Author's Checklist

• [ ]

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• Start Time: 2023-07-25T08:55:21.707+0000

• Duration: 15 min 50 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)	💚 4.938
Lines	93.229% (358/384)	👍 13.384
Conditionals	100.0% (0/0)	💚

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Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[kcreddy]

LGTM 👍🏼

[elasticmachine]

Package akamai - 2.12.0 containing this change is available at https://epr.elastic.co/search?package=akamai