Post-failure logging from inside UDB

The post-failure logging tool is very useful, but it would be even better if the logging output could be generated from within UDB. Partly because it’s tidier to have the debug session all in one place, but also because the standalone tool takes time to start up and load in the recording - hopefully this could be avoided since UDB already has the recording loaded into memory.

@nbull This would also mean that we could overcome the limitation PFL currently has with recordings of stripped binaries. These recordings are not usable with PFL because it cannot find the symbols to generate the logs.

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