feat(balance): improve airship air drag

[WishDuck]

Purpose of change (The Why)

In #7153 I did not know how to add airship drag well so didn't add a great version
Come today when drag was being polished I received a suggestion

@WishDuck Sorta related, the reference area when getting the drag coeff for airships should be taken as the square of the cube root of the airship's lift bag volume. Submurged bodies like boats use the wetted surface area, not the wetted volume like the code is using

Describe the solution (The How)

Add airship drag coeff like retagin suggests

Describe alternatives you've considered

Keep balloons without drag
Somehow use the normal system instead of retagins suggestion

Testing

CRIT blimp went up
Old blimp stayed about the same
Scales correctly with blimp balloon size

Additional context

I thought eepy brain could get this right unlike things like

ITTC 1957 puts a suggested approximation of 0.075/ (log10(Reynolds number) -2)^2
Reynolds number is (Velocity * Longest_hull_dimension * fluid_density (water is 1)) / water_dynamic_viscosity (just take it at 1.0016 mPa*s)

Eepy brain would make so many mistakies

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.