Feat: Add split_by_space and match_any_term_with_digits

[pdahale95]

Added option to split sentence in to words simply by spaces in parse_words method and option to consider any term with digits as acronym in is_acronym method.
Passing split_by_space and match_any_term_with_digits as True helps to solve below issues
#54
wolfgarbe/SymSpell#34

[codecov-io]

Codecov Report

Merging #66 into dev will increase coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev      #66      +/-   ##
==========================================
+ Coverage   95.21%   95.25%   +0.04%     
==========================================
  Files           4        4              
  Lines         689      695       +6     
  Branches      180      184       +4     
==========================================
+ Hits          656      662       +6     
  Misses         16       16              
  Partials       17       17

Impacted Files	Coverage Δ
symspellpy/helpers.py	80% <100%> (+1.42%)	⬆️
symspellpy/symspellpy.py	96.98% <100%> (ø)	⬆️

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