Add convenience overloads to isValid()

[jonaskello]

Fixes #54

[jonaskello]

Not sure this is actually a good idea since internally the overloads will have to do error handling for invalid strings.

Now it is handled like this

• Invalid PropertyValueSet string => exception becuase this is how fromString() works for PropertyValueSet
• Invalid PropertyFilter string => Empty PropertyFilter

[codecov]

Codecov Report

Base: 53.68% // Head: 53.71% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (9a4ced0) compared to base (889c1ea).
Patch coverage: 60.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
+ Coverage   53.68%   53.71%   +0.02%     
==========================================
  Files          49       49              
  Lines        2142     2156      +14     
  Branches      513      552      +39     
==========================================
+ Hits         1150     1158       +8     
- Misses        988      992       +4     
- Partials        4        6       +2     

Impacted Files	Coverage Δ
packages/property/src/property-filter.ts	62.65% <60.00%> (-1.12%)	⬇️

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