rust: Implement more memory-efficient protover datatype.

 * ADD new protover::protoset module.
 * ADD new protover::protoset::ProtoSet class for holding protover versions.
 * REMOVE protover::Versions type implementation and its method
   `from_version_string()`, and instead implement this behaviour in a more
   rust-like manner as `impl FromStr for ProtoSet`.
 * MOVE the `find_range()` utility function from protover::protover to
   protover::protoset since it's only used internally in the
   implementation of ProtoSet.
 * REMOVE the `contract_protocol_list()` function from protover::protover and
   instead refactor it (reusing nearly the entire thing, with minor superficial,
   i.e. non-behavioural, changes) into a more rusty
   `impl ToString for ProtoSet`.
 * REMOVE the `expand_version_range()` function from protover::protover and
   instead refactor it into a more rusty implementation of
   `impl Into<Vec<Version>> for ProtoSet` using the new error types in
   protover::errors.
 * FIXES part of #24031: https://bugs.torproject.org/24031.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/rust/protover/lib.rs b/src/rust/protover/lib.rs
index 2455d50818..9a9f92ed74 100644
--- a/src/rust/protover/lib.rs
+++ b/src/rust/protover/lib.rs
@@ -35,6 +35,7 @@ extern crate tor_util;
 extern crate tor_log;
 
 pub mod errors;
+pub mod protoset;
 mod protover;
 pub mod ffi;