Abstract out command parse exceptions into their own package

[markgcera]

No description provided.

[codecov]

Codecov Report

Merging #250 (574716d) into master (32a7f0c) will decrease coverage by 0.10%.
Report is 9 commits behind head on master.
The diff coverage is 68.18%.

❗ Current head 574716d differs from pull request most recent head 5294bea. Consider uploading reports for the commit 5294bea to get more accurate results

@@             Coverage Diff              @@
##             master     #250      +/-   ##
============================================
- Coverage     67.31%   67.21%   -0.10%     
- Complexity      518      523       +5     
============================================
  Files            88       94       +6     
  Lines          1857     1876      +19     
  Branches        209      210       +1     
============================================
+ Hits           1250     1261      +11     
- Misses          537      544       +7     
- Partials         70       71       +1     

Files	Coverage Δ
src/main/java/seedu/address/logic/Messages.java	90.90% <ø> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	90.90% <100.00%> (-9.10%)	⬇️
.../seedu/address/logic/parser/BookingBookParser.java	91.30% <100.00%> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	100.00% <100.00%> (ø)
.../seedu/address/logic/parser/FindCommandParser.java	100.00% <100.00%> (ø)
...eedu/address/logic/parser/JsonInjectionParser.java	100.00% <100.00%> (ø)
...parser/exceptions/JsonInjectionParseException.java	100.00% <100.00%> (ø)
...and/parse/exceptions/AddCommandParseException.java	100.00% <100.00%> (ø)
...nd/parse/exceptions/FindCommandParseException.java	100.00% <100.00%> (ø)
...nd/parse/exceptions/HelpCommandParseException.java	100.00% <100.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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[AryanG01]

LGTM