Add a native_sim build configuration to the main app & clarify docs a bit

[TjazVracko]

Description

1. Add a native_sim build config to the main app - this is a useful additional example
2. Clarify some things in the docs.

Areas of interest for the reviewer

All

Checklist

• My code follows the style guidelines as defined by IRNAS.
• I have performed a self-review of my code.
• My changes generate no new warnings.
• I added/updated source code documentation for all newly added or changed functions.
• I updated all customer-facing technical documentation.

After-review steps

• I will merge PR by myself.

[TjazVracko]

• fix: Update make codechecker to use twister build types #53
• Add a native_sim build configuration to the main app & clarify docs a bit #52 👈 (View in Graphite)
• main

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[klancarLuka]

Good work! 💪

[TjazVracko]

Merge activity

• Jun 30, 6:54 AM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 30, 6:55 AM UTC: @TjazVracko merged this pull request with Graphite.