[devex] add Move syntax highlighting on GitHub

[sblackshear]

Should make it nicer to review PR's and browse Move code on GitHub.

[jolestar]

Thanks for your contribution.

[codecov]

Codecov Report

Merging #3159 (4be0ce2) into master (a76beb8) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3159      +/-   ##
==========================================
+ Coverage   32.34%   32.36%   +0.02%     
==========================================
  Files         503      503              
  Lines       46274    46274              
  Branches    21174    21174              
==========================================
+ Hits        14965    14972       +7     
- Misses      17464    17467       +3     
+ Partials    13845    13835      -10     

Flag	Coverage Δ
unittests	32.36% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
config/src/helper.rs	49.02% <0.00%> (-5.88%)	⬇️
chain/open-block/src/lib.rs	33.56% <0.00%> (-5.26%)	⬇️
vm/types/src/token/token_code.rs	35.30% <0.00%> (-4.70%)	⬇️
executor/src/executor.rs	50.00% <0.00%> (-4.16%)	⬇️
vm/vm-runtime/src/metrics.rs	29.17% <0.00%> (-4.16%)	⬇️
txpool/src/pool/listener/tests.rs	10.91% <0.00%> (-3.63%)	⬇️
consensus/src/difficulty.rs	41.18% <0.00%> (-3.52%)	⬇️
...s/forkable-jellyfish-merkle/src/mock_tree_store.rs	33.90% <0.00%> (-3.38%)	⬇️
commons/forkable-jellyfish-merkle/src/lib.rs	46.37% <0.00%> (-3.06%)	⬇️
vm/types/src/transaction_metadata.rs	65.68% <0.00%> (-2.98%)	⬇️
... and 56 more

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