feat(HIS): add STMT his metric

[AfonsoSantos96]

This PR introduces the feature of checking the number of statements within each function.
Each function must only have a maximum of 50 statements.
The pmccabe tool is used to check this metric.

Edited by @danielRep :
To test with https://github.com/bao-project/bao-his-tests just run the command make ci METRIC=stmt.

Checklist:

• The changes generate no new warnings when building the project. If so, I have justified above.
• I have run the CI checkers before submitting the PR to avoid unnecessary runs of the workflow.

[danielRep]

Tested and it LGTM.

The merge-base changed after approval.

[danielRep]

Updated with the modifications introduced in #68 and changed the output format.

[miguelafsilva5]

I've tested this PR and it looks ok to me. However, I found that the tool counts any macro as a single statement, regardless of its contents. A function-like macro easily "hide" several statements from this tool.
Also, while correct, inline assembly can "hide" statements like function calls, and the tool counts it as a single statement.

[danielRep]

I've tested this PR and it looks ok to me. However, I found that the tool counts any macro as a single statement, regardless of its contents. A function-like macro easily "hide" several statements from this tool.

Yes, that's a big limitation from pmccabe. From its manual:

Parsing
pmccabe ignores all cpp preprocessor directives - calculating the complexity of the
appearance of the code rather than the complexity after the preprocessor mangles the code.
This is especially important since simple things like getchar

However, I didn't found any other tool that outputs number of statements per function as pmccabe does. I'll keep looking.

Also, while correct, inline assembly can "hide" statements like function calls, and the tool counts it as a single statement.

Didn't get this second point, could you share an example?