[salesforce] Implement logout_stream data stream for Salesforce

[kush-elastic]

• Enhancement

What does this PR do?

• Generated the skeleton of Salesforce integration package.
• Added 1 data stream ( logout_stream )
• Added data collection logic.
• Added the ingest pipelines.
• Mapped fields according to the ECS schema and added Fields metadata in the appropriate yml files.
• Added system test cases.

Related issues

• Relates Create package for Salesforce integration #3940
• Relates [salesforce] Add salesforce package foundation along with login_rest data stream #4261
• Relates [salesforce] Add salesforce package foundation along with logout_rest data stream #4323
• Relates [salesforce] Implement apex data stream for Salesforce #4410
• Relates [salesforce] Implement setupaudittrail data stream for Salesforce #4356
• Relates [Salesforce] Add pagination support for login_rest and logout_rest data streams #4866
• Relates [salesforce] Implement login_stream data stream for Salesforce #4941

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.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^8.7.0).

How to test this PR locally

• Clone integrations repo.
• Install elastic-package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/salesforce directory.
• Run the following command to run tests.

elastic-package test

[elasticmachine]

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Build stats

• Start Time: 2023-04-28T11:02:12.997+0000

• Duration: 16 min 11 sec

Test stats 🧪

Test	Results
Failed	0
Passed	34
Skipped	0
Total	34

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚
Classes	100.0% (6/6)	💚
Methods	98.649% (73/74)	👍 0.262
Lines	96.27% (1368/1421)	👎 -0.023
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package salesforce - 0.7.0 containing this change is available at https://epr.elastic.co/search?package=salesforce