Rust - add examples (#683)

* Rust - initial version of ex1

Example - move closure

Co-authored-by: Jed Brown <jed@jedbrown.org>

typo fix

Co-authored-by: Jed Brown <jed@jedbrown.org>

mi

Rust - add examples (#683)

* Rust - initial version of ex1

Example - move closure

Co-authored-by: Jed Brown <jed@jedbrown.org>

typo fix

Co-authored-by: Jed Brown <jed@jedbrown.org>

minor tidying

order -> degree

drop operator applicaiton messages

* rust: make top-level workspace and use libceed from path

This allows a single "cargo test" from the top level.

* rust: add version-sync (to help us remember when we publish a crate)

* examples - consistency update

* Rust - add Cargo.lock to top level gitignore

* rust - refactor example to add tests

* Rust - test and style from workspace

* Rust - update year in header

* Rust - add error values to Error, switch to String

* Rust - add input validation in check

* Rust - format volume output in example

* Rust - update example help output

* Rust - example tests rename to simplify

* Rust - split example 1 into 3 parts

* rust: std::sync::Once for CeedRegisterAll()

* Promote CeedRegisterAll() and CeedQFunctionRegisterAll() to User
* Guard calls to CeedInit() to avoid races in parallel testing

* Examples - update rust example to new builder syntax

* Examples - add rust ex2

* Rust - add CEED_STRIDES_BACKEND

* Examples - drop unused restriction in ceed ex2

* Rust - minor documentation update

* Rust - adopt convention of 'dimension-like' values all using usize; reduces casting

* Actions - add Rust code coverage

* Rust - fix usize conversion

* Rust - update casting between i32(C interface) and usize(Rust interface)

* Actions - include Rust doctests

* Actions - Rust doctest coverange only avaliable in nightly

* Rust - drop explict typing of values passed to C get* functions

* Rust - modify version numbers tests, cargo-tarpaulin and cargo have different calling paths in tests

* cargo fmt

* Examples - add separate Rust example quiet mode

* Actions - rustfmt not always avaliable on nightly

* Rust - simplify version tests

* Actions - add a few notes

* CodeCov - try adding gallery to 'fixes'

* CodeCov - drop some codecov noise in examples

* Examples - test all combinations in ex1/ex2

* Rust - test 3d examples without quiet flag

* Actions - use gcc-10 for compatibility in gcov reports

* Examples - test gallery in 1/2/3d in Rust ex

* Gitlab - also report gcov version

* JUnit - adjust indentation

* Gitlab - make it easier to find complier info in logs

* Tests - fix minor styling strangeness in t002

* Actions - only upload rust coverage

* Actions - exclude non-rust files from rust coverage

* Cov - exclude weak symbols code, not useful cov info

* Examples - clean up options creation for tests in Rust examples

* Examples - simplify tolerance for testing Rust examples

* cargo fmt

* Examples - another match

* Examples - common Rust example code in shared local crate

Co-authored-by: Jed Brown <jed@jedbrown.org>

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