Make eugene trace and eugene lint support multiple files and folders as input

[kaaveland]

Take a stab at https://github.com/kaaveland/eugene/issues/65 by hooking up eugene trace and eugene lint with script discovery. It recognizes flyway style folders of versioned migrations and sequence numbered scripts automatically. This is an early version still, and there's lots of behavioural changes to look at (eg. should we automatically set --commit, or refuse to trace many scripts when it isn't set?)

The most important parameters of the current behaviour are:

• We never sort parameters provided on the command line. This means that we run scripts in the order they are provided.
• When provided a folder, we list all files ending in .sql and if they all have the same naming standard (eg. V1._name.sql or 13..sql), we sort them in the correct order and run on them.
• We currently reuse the connection for eugene trace, but I think we may need to clean up session state to keep doing this.
• We run 1 script at the time, print the report and keep going.
• Unless there's an error, we run on all scripts before we set the exit code.

[kaaveland]

I will be so surprised if this works on windows on the first attempt.

[kaaveland]

Fixed:

• Reuse client between traced transactions by doing RESET ALL to clear session state
• Expose --sort-mode to enable sorting lexicographically in addition to auto-detection of flyway naming and sequence number naming