feat: RAII wrapper for ProjArea

[y1lan]

The normal manually destroy calling cannot cover the error path, which
is different from C language where every path is explicitly noted by
human.

RAII Wapper would help compiler to insert the drop glue correctly.

Pick test test_from_crs_error as an entry point:

#[test]
fn test_from_crs_error() {
    match Proj::new_known_crs("EPSG:4326", "🦀", None) {
        Err(ProjCreateError::ProjError(..)) => (),
        _ => unreachable!(),
    }

    match Proj::new_known_crs("🦀", "EPSG:4326", None) {
        Err(ProjCreateError::ProjError(..)) => (),
        _ => unreachable!(),
    }
}

function transform_epsg would early return, but the resource created by proj_area_create is not released.

similar problem happens on function crs_to_crs_from_pj.

• I agree to follow the project's code of conduct.
• I added an entry to the project's change log file if knowledge of this change could be valuable to users.
  • Usually called CHANGES.md or CHANGELOG.md
  • Prefix changelog entries for breaking changes with "BREAKING: "

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