Fix validation for package name.

[d0cd]

This PR fixes the check on the package name when invoking leo new <package_name>. Package names are now checked to be valid identifiers, which should correspond to the requirements imposed by Aleo instructions.

[codecov[bot]]

Codecov Report

Merging #2128 (977dcd3) into testnet3 (59d3574) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           testnet3    #2128      +/-   ##
============================================
+ Coverage     81.73%   81.77%   +0.03%     
============================================
  Files           147      147              
  Lines          6696     6688       -8     
  Branches       6696     6688       -8     
============================================
- Hits           5473     5469       -4     
+ Misses         1223     1219       -4     

Impacted Files	Coverage Δ
compiler/span/src/source_map.rs	82.32% <100.00%> (ø)
leo/package/src/package.rs	100.00% <100.00%> (+8.69%)	:arrow_up:

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