Remove EverCrypt support

[achamayou]

Summary

• remove the EverCrypt CMake option, external build wiring, and C/ASM language requirements
• delete the dedicated comparison test and strip EverCrypt hooks from shared tests
• retain the OpenSSL-only hash benchmarks

Testing

• default Debug build and CTest suite
• OpenSSL-enabled Debug build and CTest suite

[Copilot]

Pull request overview

This PR removes EverCrypt integration from merklecpp’s build and test infrastructure, cleaning up test/benchmark code paths that depended on EverCrypt while keeping the OpenSSL-based benchmarks available when OpenSSL is enabled.

Changes:

• Removed the EVERCRYPT CMake option and the EverCrypt external build wiring (including C/ASM language requirements).
• Deleted the dedicated EverCrypt comparison test and removed EverCrypt hooks from shared benchmark/test programs.
• Kept the OpenSSL-only hash benchmarks/tests gated behind OPENSSL.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
CMakeLists.txt	Drops C/ASM project languages and removes EverCrypt option + external library wiring.
test/CMakeLists.txt	Removes the EverCrypt-only test and gates hash comparison/bench test on OPENSSL only.
test/compare_evercrypt.cpp	Deleted EverCrypt comparison test program.
test/compare_hash_functions.cpp	Removes EverCrypt comparison/benchmark paths, leaving merklecpp/OpenSSL benchmark paths.
test/time_large_trees.cpp	Removes EverCrypt benchmark path and updates benchmark labeling.
test/demo_tree.cpp	Removes EverCrypt include hook.
test/serialise_to_file.cpp	Removes EverCrypt include hook.

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