feat: adding llvm source based coverage

[jrmncos]

#1174
Adding coverage to all directories declared in members excepting /examples
The changes were tested locally and the file generated by llvm-cov (llvm-cov-output.lcov) can be parsed as html and it's displaying the coverage correctly. Also the step Generate code coverage is running successfully.

As a final step to fully test this change is to setup the variable ${{ secrets.CODECOV_TOKEN }} in the repo settings. More info here: https://docs.codecov.com/docs/quick-start#getting-started If someone can set that variable it would be great.
I did it in my forked repo, and I received an email with something like Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

BTW, I have been dedicating most part of my time and effort to test the directory /examples with the tool wasmcov #1233 . I was able to generate the .profdata files for each directory, and maybe the next step it's to merge it and to integrate it with the changes of this PR. I'm working with @bbarwik was helping me to integrate the tool and I'm waiting for the next release that fix some bugs.

I would like to close this one and to continue working on #1233 with an accurate plan to ingrate /examples directory

@race-of-sloths include

[codecov-commenter]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️

[jrmncos]

@frol this is ready for review :)

[frol]

@jrmncos Could you, please, also provide a link for a CI test run on your fork? It would be great to see that it fully works before we merge it into the master (I'd like to avoid us debugging CI in production)

[frol]

It will take too much time on every CI run. Can we use Linux as a host? It will be much faster to install it there.

[jrmncos]

in this repo: https://github.com/near/near-sdk-rs/actions/runs/10295407665/job/28495033969?pr=1236
in my fork: https://github.com/jrmncos/near-sdk-rs/actions/runs/10295407683/job/28495034208?pr=1

it's takes ~8 minutes approximately. Let's try with Linux to reduce it

[jrmncos]

hey @frol I tried with ubuntu, and the longer step, that is 'Generate code coverage' it takes 7m:48seg https://github.com/near/near-sdk-rs/actions/runs/10360531522/job/28679132518
and with mac os 5m 36s
https://github.com/near/near-sdk-rs/actions/runs/10360643219/job/28679480453?pr=1236\

Even with the installation of Brew the total time of macos is still less. Also, the longer step in the GitHub actions pipelines it's Test core and it takes > 8m (this is the total time of coverage)

I tried using - uses: Swatinem/rust-cache@v1
as cache but has not improved the total time

[frol]

<10 minutes for code-coverage is not that bad. Let's see it in action!

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