Release CBMC 6.10.0

[tautschnig]

This release includes a workaround for a Z3 unsoundness in prior releases of Z3 (via #9011), fixes SMT encoding problems (via #9012), improves support for floating-point processing in the in-tree SMT2 solver (via #8889, among others), but also removes support for CVC 3 and CVC 4 (via #8967).

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• n/a Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[Copilot]

Pull request overview

Prepares the CBMC 6.10.0 release by updating the project version metadata and adding the corresponding release notes to the changelog.

Changes:

• Bump CBMC core version to 6.10.0 in the build configuration.
• Bump the libcprover_rust crate version to 6.10.0.
• Add a new “CBMC 6.10.0” section to CHANGELOG summarizing key merged PRs.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/libcprover-rust/Cargo.toml	Updates Rust crate version to 6.10.0.
src/config.inc	Updates CBMC_VERSION to 6.10.0 for builds/packaging.
CHANGELOG	Adds release notes for CBMC 6.10.0 and comparison link.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.68%. Comparing base (90da45f) to head (e41f98f).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9080   +/-   ##
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  Coverage    80.68%   80.68%           
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  Files         1714     1714           
  Lines       189522   189522           
  Branches        73       73           
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  Hits        152925   152925           
  Misses       36597    36597           

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