appsec: add Start() and Stop() to API

[eliottness]

What does this PR do?

This PR adds Start and Stop and options to it on the appsec public API for a programmatic access to enabling ASM Threats.

Motivation

We would like to have a way to enable and configure ASM directly in consul internally in Datadog. A Version 1 of this works already but requires to redeploy everything which can be slow and cannot be done by us. A way to dynamically activate ASM but more granularly than Remote Activation is required to make this happen.

Reviewer's Checklist

• [ ] Changed code has unit tests for its functionality at or near 100% coverage.
• [ ] System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• [ ] There is a benchmark for any new code, or changes to existing code.
• [ ] If this interacts with the agent in a new way, a system test has been added.
• [ ] Add an appropriate team label so this PR gets put in the right place for the release notes.
• [ ] Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

For Datadog employees:

• [ ] If this PR touches code that handles credentials of any kind, such as Datadog API keys, I've requested a review from @DataDog/security-design-and-guidance.
• [ ] This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-01-25 16:50:37

Comparing candidate commit 33d82494ed553ad49282f46d1b53b2c1f415e44d in PR branch eliott.bouhana/public-appsec-start with baseline commit c03c56b47042238f18d16f623b4f6918a9a14e9c in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 39 metrics, 2 unstable metrics.

[github-actions[bot]]

This PR is stale because it has been open 20 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[github-actions[bot]]

This PR was closed because it has been open for 30 days with no activity.