Allow to disable coverage.serialized report and reduce memory usage.

[adrenalinkin]

What are you trying to achieve?

Currently SebastianBergmann\CodeCoverage\Report\PHP runs by default
Saving this report consumes a lot of memory for the large projects.
I want to be able to disable generating this type of coverage report.

What do you get instead?

My propose to add some new option --disable-coverage-php this will not provoke BC changes

php bin/codecept run unit --coverage --coverage-html --disable-coverage-php

Or changing behaviur of the CLI. If we was't call --coverage option but call any other --coverage-* format than don't generate default php serialize report.

php bin/codecept run unit --coverage-html