ADD: Add CMake build option for tests and example C++ program

[T-K-233]

Add support to build tests with CMake:

To build the programs, do

# cd ./tests/
cmake . -S ./ -B ./build/ -D CMAKE_BUILD_TYPE=Debug
cmake --build ./build/ --target all

To clean the previous build, do

# cd ./tests/
cmake --build ./build/ --target clean

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• Did you mark the PR with a changelog: label?
• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you add a test demonstrating the PR?

• (If applicable) Did you mark the PR as Please Backport?

CI Help:
Add the following labels to modify the CI for a set of features.
Generally, a label added only affect subsequent changes to the PR (i.e. new commits, force pushing, closing/reopening).
See ci:* for full list of labels:

• ci:fpga-deploy - Run FPGA-based E2E testing
• ci:local-fpga-buildbitstream-deploy - Build local FPGA bitstreams for platforms that are released
• ci:disable - Disable CI

[jerryz123]

All the C programs build with this too? That's neat.

Can you replace the existing makefile such that 'make' just invokes cmake?

[T-K-233]

I don't think using make to invoke cmake is a good idea... It's a bit convoluted.
If we want to use cmake to replace the current make flow, I can write a .sh script to abstract away the cmake commands, so user would just need to call something like ./build.sh.

[jerryz123]

Replacing it with build.sh is fine to me too. Note that many parts of the CI scripts call make, those would have to be changed to build.sh