Allow HEC endpoint to be configured

[vears91]

Proposed changes

Allow the HEC endpoint to be configured, instead of using the hardcoded services/collector endpoint. Closes #221

Types of changes

What types of changes does your code introduce?
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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• I have read the CONTRIBUTING doc
• I have read the CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• Any dependent changes have been merged and published in downstream modules

[hvaghani221]

Can you resolve the conflict? I can merge these changes. But helm chart's changes can only be merged when the plugin changes are released.

[vears91]

Can you resolve the conflict? I can merge these changes. But helm chart's changes can only be merged when the plugin changes are released.

Hi @harshit-splunk, I have solved the conflict

[hvaghani221]

LGTM!!