Provide Possibility To Reset Config Values

It is a good idea to properly isolate tests. However, this is currently not possible when working with configuration values.

### Preconditions
1. Magento 2.3.3
2. MFTF 2.4.3

### Steps to reproduce
1. Have a M2 installation of a client.
2. Write a test with config changes.
3. Run the test.

### Expected result
1. After the test has run, the configuration should be exactly like before.

### Actual result
1. It is currently not possible to reset config values to the values that were configured before the test was run. There should be a possibility to do so.

The issue provides no file, test, or entry point to begin with. Reproduce the behavior using Magento 2.3.3 and MFTF 2.4.3, then trace how a test applies configuration changes. Done means a test can finish with every configuration value restored to its pre-test state.

Written by the indexing model from the issue text.