Function provider SPI

[mbali]

The new FunctionProvider Service Provider Interface simplifies the extension of the function set provided by Stencil.

Implementing and registering these new implementations in META-INF/services/io.github.erdos.stencil.functions.FunctionProvider enable other libraries to register their functions automatically.

[codecov[bot]]

Codecov Report

Merging #138 (e05ce09) into master (82c07c8) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #138   +/-   ##
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  Coverage   92.01%   92.01%           
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  Files          26       26           
  Lines        1904     1904           
  Branches      107      107           
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  Hits         1752     1752           
  Misses         45       45           
  Partials      107      107           

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