Rust - shrink prelude

[jeremylt]

Ok, dropped a lot of the contents of the prelude, mirroring changes in petsc-rs.

Also made some clippy fixes.

fixes #1599

[jeremylt]

Note: 0b72886 is the commit with the meaningful changes

[jeremylt]

Only one clippy issue remaining, and its not one under our control:

$ cargo clippy
warning: first doc comment paragraph is too long
  --> /home/jeremy/Dev/libCEED/target/debug/build/libceed-sys-fbdae9980ac1442f/out/bindings.rs:78:1
   |
78 | / #[doc = " Implementation takes ownership of the pointer and will free using CeedFree...
79 | | #[doc = " The user should not assume that the pointer remains valid after ownership ...
80 | | #[doc = " Note that arrays allocated using C++ operator new or other allocators cann...
81 | | #[doc = " CeedFree() is capable of freeing any memory that can be freed using free()."]
   | |_
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_long_first_doc_paragraph
   = note: `#[warn(clippy::too_long_first_doc_paragraph)]` on by default
help: add an empty line
   |
78 ~ #[doc = " Implementation takes ownership of the pointer and will free using CeedFree() when done using it."]
79 + ///
   |

warning: `libceed-sys` (lib) generated 1 warning (run `cargo clippy --fix --lib -p libceed-sys` to apply 1 suggestion)
    Checking libceed v0.12.0 (/home/jeremy/Dev/libCEED/rust/libceed)
    Checking mesh v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/mesh)
    Checking ex1-volume v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex1-volume)
    Checking ex4-vector-surface v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex4-vector-surface)
    Checking ex3-vector-volume v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex3-vector-volume)
    Checking ex2-surface v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex2-surface)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.55s

[jedbrown]

We can either turn off that lint or insert an empty line after the subject/summary sentence?

[jeremylt]

Ah, found where to stick the annotation for the generated bindings. Clippy now runs clean

$ cargo clippy
    Checking utf8parse v0.2.2
    Checking colorchoice v1.0.2
    Checking anstyle v1.0.8
    Checking anstyle-query v1.1.1
    Checking is_terminal_polyfill v1.70.1
    Checking strsim v0.11.1
    Checking clap_lex v0.7.2
   Compiling libceed-sys v0.12.0 (/home/jeremy/Dev/libCEED/rust/libceed-sys)
    Checking anstyle-parse v0.2.5
    Checking anstream v0.6.15
    Checking clap_builder v4.5.15
    Checking clap v4.5.16
    Checking libceed v0.12.0 (/home/jeremy/Dev/libCEED/rust/libceed)
    Checking mesh v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/mesh)
    Checking ex4-vector-surface v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex4-vector-surface)
    Checking ex1-volume v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex1-volume)
    Checking ex2-surface v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex2-surface)
    Checking ex3-vector-volume v0.11.0 (/home/jeremy/Dev/libCEED/examples/rust/ex3-vector-volume)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.99s