Allocate inventory queue

[varas]

Description of the changes

This PR allocates a configurable inventory queue in the same fashion as metrics/events.

By doing so inventory processing flow won't block unless queue length is reached.

By defaults sets inventory queue size to 10 datasets.

I won't make this testable as inventory for integrations is likely to EOL soon.

ToDo:

• Documentation

PR Review Checklist

Author

• the PR should focus on a single subject. Change only relevant files to the problem you’re working on
• clean and format the code
• add unit tests for your changes and make sure all unit tests are passing
• add a risk label after carefully considering the "blast radius" of your changes
• describe the intent of your changes in the description. don't just rewrite your code in prose
• assign at least one reviewer
• address the feedback
• add a "ready for review" label. Only PRs with this label will be reviewed.

Reviewer

• review code for readability
• verify that high risk behavior changes are well tested
• check license for any new external dependency
• ask questions about anything that isn't clear and obvious
• approve the PR when you consider it's good to merge

[coveralls]

Pull Request Test Coverage Report for Build 208768063

• 1 of 31 (3.23%) changed or added relevant lines in 1 file are covered.
• 86 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.01%) to 55.798%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/agent/agent.go	1	31	3.23%

Files with Coverage Reduction	New Missed Lines	%
internal/agent/event_sender_vortex.go	1	73.21%
pkg/config/loader/config.go	85	70.82%

Totals
Change from base Build 205845102:	0.01%
Covered Lines:	8835
Relevant Lines:	15834

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💛 - Coveralls

[carlosroman]

LGTM 👍