Implement LcovMerger. LcovMerger is a tool that merges all the intermediate lcov tracefiles (with .dat extension) found under a coverage directory and prints the merged tracefile to a given output file. A custom implementation for merging lcov tracefiles is needed because the merging functionality of lcov itself is very slow. LcovMerger is required to get a single coverage report (lcov tracefile) from a bazel coverage command that executes multiple tests. ATM LcovMerger is only invoked by tools/test/collect_coverage.sh that collects and merges the tracefiles from a single test invocation. It will also be used from a CoverageReportAction. Progress on #5246. PiperOrigin-RevId: 200054506
{Fast, Correct} - Choose two
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