…io-rs#786)

* Allow file descriptor be generated without --include_source_info

The file descriptor sets generated by rules_proto in bazel don't have
this by default, so this allows some flexibility for users to reuse
results that are already available to them.  It's fairly trivial
adjustment so it seemed reasonable to me to allow the flexibility.

* revert breaking changes and add default

closes tokio-rs#783

…okio-rs#803)

* Fix issue with negative nanos in Duration::try_from(), and add a unit test

* add proptest for negative nanos

* PR comment: remove spurious dbg

)

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

This commit adds two new compile functions that allow passing a
`FileDescriptorSet` and it will generate the Rust code. This allows
users to use libraries like `protox` directly and in an ergonomic way.

Introduced in tokio-rs#801
Closes tokio-rs#823

tokio-rs#828)

* Add existing roundtrip test to Kani CI

* Bump up Kani version

* Remove `v` from GA version

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

This library will fail to build with the following error when checked
out into a directory not named exactly `prost`:

  error: failed to load manifest for workspace member `/home/alex/src/prost-rs/tests/single-include`

  Caused by:
    failed to load manifest for dependency `prost`

  Caused by:
    failed to read `/home/alex/src/prost/Cargo.toml`

  Caused by:
    No such file or directory (os error 2)

This is because the `single-include` test depends on `prost` with the
path `../../../prost`. This patch fixes the issue by correcting the path
to `../..`.

This allows the user to request boxing of specific fields. This is useful for
enum types that might have variants of very different size.

Co-authored-by: Lucio Franco <luciofranco14@gmail.com>

# Conflicts:
#	.github/workflows/continuous-integration-workflow.yaml
#	Cargo.toml
#	prost-build/src/lib.rs