Allow hiding some output values

[irongut]

Feature Request

Not all tools output Branch Rate & Complexity even though they use Cobertura format, see #20. Options to hide the missing values would be useful for compatibility with coverage.py & similar tools.

Since Line Rate is used for the badge, health indicators & failing the workflow an option to hide it would make no sense.

Expected Behaviour

• Add option hide_branch_rate, default false
• Add option hide_complexity, default false

Additional Context

Linked To

#17 Test compatibility with other tools
#20 What does complexity mean?

[irongut]

coverage.py output is similar to:

<coverage branch-rate="0" branches-covered="0" branches-valid="0" complexity="0" line-rate="0.6500" lines-covered="65" lines-valid="100" timestamp="1635484070186" version="6.0.2">
    <packages>
        <package branch-rate="0" complexity="0" line-rate="0.6500" name="one" />
        <package branch-rate="0" complexity="0" line-rate="0.6000" name="two" />
        <package branch-rate="0" complexity="0" line-rate="0.7000" name="three" />
    </packages>
</coverage>

(Details not relevant to CCS omitted.)