Handle solc links in repo when fetching compiler

[marcocastignoli]

See #975 for details

_{View in Huly HI-704}

[marcocastignoli]

In this way I'm saving the file in the repo with the "wrong name", but I think it makes sense. Because that's the solc name specified in the metadata.

E.g.

1. sourcify asks for soljson-v0.5.14+commit.1f1aaa4.js
2. soljson-v0.5.14+commit.1f1aaa4.js is actually a link to soljson-v0.5.14+commit.01f1aaa4.js
3. fetch soljson-v0.5.14+commit.01f1aaa4.js but save it as soljson-v0.5.14+commit.1f1aaa4.js
4. next time soljson-v0.5.14+commit.1f1aaa4.js is requested, the file is read locally

A potential enhancement would be to store also soljson-v0.5.14+commit.01f1aaa4.js as a link to soljson-v0.5.14+commit.1f1aaa4.js

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -2.24 ⚠️

Comparison is base (9f73842) 77.58% compared to head (ca07fa3) 75.34%.

Additional details and impacted files

@@             Coverage Diff             @@
##           staging     #979      +/-   ##
===========================================
- Coverage    77.58%   75.34%   -2.24%     
===========================================
  Files           29       36       +7     
  Lines         1374     2008     +634     
  Branches       254      392     +138     
===========================================
+ Hits          1066     1513     +447     
- Misses         180      288     +108     
- Partials       128      207      +79     

Flag	Coverage Δ
lib-sourcify	69.71% <ø> (?)
server	77.94% <ø> (+0.36%)	⬆️

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see 8 files with indirect coverage changes

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