chore: update Cargo.toml generation

[albersonmiranda]

This PR follows #461.

As required for wasm build, adds the following lines to Cargo.toml template in use_extendr():

[profile.release]
lto = true
codegen-units = 1

Closes #463.

[JosiahParry]

jesus i just did this myself. Lol i need to get notifications

[JosiahParry]

Copying comment from my PR

This PR closes #463 and is a follow up to #461 for WebR support (and generally overall binary size).

It adds lto=true and codegen-units=1 to the release profile. This is seemingly required (at least lto = true) for WASM compatibility—otherwise the symbols generated are incompatible with emscripten.

[JosiahParry]

Migrated my news update to this PR. thanks everyone!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.71%. Comparing base (b226db3) to head (e5e8af1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

Files with missing lines	Coverage Δ
R/use_extendr.R	98.66% <100.00%> (+0.02%)	⬆️

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