This PR achieves the following:

1. Add static loadMappings(String rootDir) method in WireMock.java for default instance usage

Note: The method loadMappingsFrom(String rootDir) already exists in WireMock.java, and thus the new method had to be named differently i.e. loadMappings().

References

• Proposal: Add static loadMappingsFrom(...) methods in WireMock.java for default instance usage #3102

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• Test coverage that demonstrates that the change works as expected
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