chore: move some functions to a new appsec/_capabilities.py file to avoid cyclic imports

[juanjux]

Fixes a potencial cyclic import when importing appsec.utils._appsec_rc_capabilities.

Checklist

• Change(s) are motivated and described in the PR description.
• Testing strategy is described if automated tests are not included in the PR.
• Risk is outlined (performance impact, potential for breakage, maintainability, etc).
• Change is maintainable (easy to change, telemetry, documentation).
• Library release note guidelines are followed. If no release note is required, add label changelog/no-changelog.
• Documentation is included (in-code, generated user docs, public corp docs).
• Backport labels are set (if applicable)

Reviewer Checklist

• Title is accurate.
• No unnecessary changes are introduced.
• Description motivates each change.
• Avoids breaking API changes unless absolutely necessary.
• Testing strategy adequately addresses listed risk(s).
• Change is maintainable (easy to change, telemetry, documentation).
• Release note makes sense to a user of the library.
• Reviewer has explicitly acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment.
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-08-21 12:48:16

Comparing candidate commit 27e01d9 in PR branch juanjux/fix-utils-cyclic-import with baseline commit 8973f5f in branch 1.x.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 93 metrics, 0 unstable metrics.

scenario:flasksimple-appsec-telemetry

• 🟩 max_rss_usage [-1033.060KB; -883.459KB] or [-3.027%; -2.588%]