feat: Add item count based vehicle storage

[WishDuck]

Purpose of change (The Why)

Some kind of cheap option that can load one single furniture or object regardless of volume would be nice

Describe the solution (The How)

Add a new way for item stacks to count storage: total charges
This limits storage to a certain number of charges
While it could be implemented in furnture, currently only implemented in vehicle land

Describe alternatives you've considered

Give up on balanced storage and give massive storage options because we want to be able to haul the one corpse
Let there be an total volume limit too?

Testing

Log truck works as expected

Additional context

I sadly did not ave a PR that reduced lines more then it added them today :(

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.

Optional

• This is a C++ PR that modifies JSON loading or behavior.
  • I have documented the changes in the appropriate location in the docs/ folder.

[github-actions]

❌ PR Title Validation Failed

conventional-prs: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.39' not found (required by conventional-prs)
conventional-prs: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by conventional-prs)

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ℹ️ How to fix

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