Consider adding cargo-semver-checks to CI

[LDeakin]

The icechunk 0.1.2 Rust crate release had a few breaking changes, so it is probably worth adding cargo-semver-checks to your CI.

cargo semver-checks --baseline-version 0.1.1 -p icechunk
    Building icechunk v0.1.2 (current)
       Built [   1.783s] (current)
     Parsing icechunk v0.1.2 (current)
      Parsed [   0.039s] (current)
     Parsing icechunk v0.1.1 (baseline, cached)
      Parsed [   0.038s] (baseline)
    Checking icechunk v0.1.1 -> v0.1.2 (minor change)
     Checked [   0.028s] 120 checks: 118 pass, 2 fail, 0 warn, 7 skip

--- failure enum_missing: pub enum removed or renamed ---

Description:
A publicly-visible enum cannot be imported by its prior path. A `pub use` may have been removed, or the enum itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.39.0/src/lints/enum_missing.ron

Failed in:
  enum icechunk::repository::RepositoryError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/repository.rs:44
  enum icechunk::store::StoreError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/store.rs:58
  enum icechunk::format::IcechunkFormatError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/format/mod.rs:218
  enum icechunk::storage::StorageError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/storage/mod.rs:61
  enum icechunk::StorageError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/storage/mod.rs:61
  enum icechunk::format::manifest::VirtualReferenceError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/format/manifest.rs:31
  enum icechunk::refs::RefError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/refs.rs:33
  enum icechunk::session::SessionError, previously in file /home/ljd/.cargo/registry/src/index.crates.io-6f17d22bba15001f/icechunk-0.1.1/src/session.rs:46

--- failure function_parameter_count_changed: pub fn parameter count changed ---

Description:
A publicly-visible function now takes a different number of parameters.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#fn-change-arity
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.39.0/src/lints/function_parameter_count_changed.ron

Failed in:
  icechunk::ops::gc::expire now takes 6 parameters instead of 4, in /home/ljd/dev/icechunk/icechunk/src/ops/gc.rs:491

     Summary semver requires new major version: 2 major and 0 minor checks failed
    Finished [   3.539s] icechunk