Training mod: using ProgressMeter.jl in `train!`

[XWHtorrentx]

Add a progress bar with display of training loss in train!(...). For training less than 1 batch there is no display of progress bar and training loss.

[darsnack]

Thanks for this contribution!

If I understand this correctly, this specifically uses ProgressMeter.jl as the front end for progress logging? Our current approach uses ProgressLogging.jl with integrates with VS Code and offers a choice of front ends. One advantage to ProgressMeter.jl is the ability to print the speed for infinite length sequences. We would need to discuss whether this is worth the change.

[ToucheSir]

We should not be using this library, but a docs PR mentioning https://github.com/JuliaLogging/TerminalLoggers.jl would be fine.

[codecov-commenter]

Codecov Report

Merging #1954 (78071e8) into master (261efb1) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1954      +/-   ##
==========================================
+ Coverage   87.72%   87.73%   +0.01%     
==========================================
  Files          19       19              
  Lines        1458     1460       +2     
==========================================
+ Hits         1279     1281       +2     
  Misses        179      179              

Impacted Files	Coverage Δ
src/optimise/train.jl	94.28% <100.00%> (+0.34%)	:arrow_up:

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