Create config migration script

[awrichar]

The goal here is to have a script that can detect configuration which was deprecated in a particular version of FireFly and then convert it to the newest format. By progressively iterating through versions, a config file may be brought up to date with the latest expected format.

The secondary goal is for this script to be as easy to maintain as possible. ~~I've prototyped a partial solution in both Python and Go. Both have their advantages, so I'm looking for input on the final choice.~~ In the end, the Python solution was not significantly simpler than the Go version, and would introduce a new language, packaging system, etc. I've decided to stick with Go.

[codecov-commenter]

Codecov Report

Merging #934 (61fe7e6) into main (e22d84a) will decrease coverage by 0.01%. The diff coverage is 100.00%.

:exclamation: Current head 61fe7e6 differs from pull request most recent head e1042e6. Consider uploading reports for the commit e1042e6 to get more accurate results

@@            Coverage Diff             @@
##             main     #934      +/-   ##
==========================================
- Coverage   99.98%   99.97%   -0.02%     
==========================================
  Files         299      301       +2     
  Lines       19478    19687     +209     
==========================================
+ Hits        19475    19682     +207     
- Misses          3        4       +1     
- Partials        0        1       +1     

Impacted Files	Coverage Δ
ffconfig/migrate/config.go	100.00% <100.00%> (ø)
ffconfig/migrate/migrations.go	100.00% <100.00%> (ø)
internal/tokens/fftokens/fftokens.go	99.53% <0.00%> (-0.47%)	:arrow_down:

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