feat(a32nx/fac): FE improvements and additions

[lukecologne]

Summary of Changes

Multiple additions to the Flight Envelope part of the FAC:

• Improves Speed Trend computation by suppressing high frequency noise through a highpass filter instead of a derivative
• Add the PITCH PITCH warning
• Add the Low Energy (SPEED SPEED SPEED) warning

Screenshots (if necessary)

References

Additional context

Discord username (if different from GitHub):

Testing instructions

How to download the PR for QA

Every new commit to this PR will cause new A32NX and A380X artifacts to be created, built, and uploaded.

1. Make sure you are signed in to GitHub
2. Click on the Checks tab on the PR
3. On the left side, find and click on the PR Build tab
4. Click on either flybywire-aircraft-a320-neo, flybywire-aircraft-a380-842 (4K) or flybywire-aircraft-a380-842 (8K) download link at the bottom of the page

[tracernz]

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