Develop basic logging test infrastructure

[abigalekim]

I wrote basic logging infrastructure that verifies whether a JSON log is valid JSON.

I refactored the logger class to include a second sink to a std::ostringstream. Then, after the test is finished running, I output the log and test whether the log is valid.

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TYPE: FEATURE DESC: Basic logging infrastructure

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #14050: Develop basic logger test infrastructure.

[abigalekim]

Also @eric-hughes-tiledb does this mean I should try to change some of the header files in logger.h?

[eric-hughes-tiledb]

header files in logger.h

Include common-std.h in that file, then use the names that have been incorporated into the global namespace without qualification.

[ihnorton]

Deferred for now.