Make giggsey/libphonenumber-for-php an optional dependency

[jeromegamez]

See #577

[codecov]

Codecov Report

Merging #578 (e7e0b50) into 5.x (7c9ce86) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                5.x     #578   +/-   ##
=========================================
  Coverage     92.73%   92.74%           
- Complexity     1578     1579    +1     
=========================================
  Files           150      150           
  Lines          3745     3747    +2     
=========================================
+ Hits           3473     3475    +2     
  Misses          272      272           

[acasademont]

@jeromegamez looks good to me, that was fast! I wasn't sure if you preferred to throw an exception if the library was not installed, but given the size of the library, I think it makes sense to make it 100% optional.

[jeromegamez]

An exception would have caused a breaking change and I'm not ready for a new major release yet 😅

Some might argue that this is also a breaking change, when a project uses the library as a transient dependency, but I already have a response prepared for that 😬

I'll merge the PR and create a new minor release soon 💪

[acasademont]

Awesome, thanks :D