Add dispatch function util functions

[camsaul]

Resolves #16

Adds dispatch-on-first-arg, dispatch-on-first-two-args`, etc. for up to 4 args.

[codecov]

Codecov Report

Base: 86.98% // Head: 87.29% // Increases project coverage by +0.30% 🎉

Coverage data is based on head (ecc48f2) compared to base (dd7fcd0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   86.98%   87.29%   +0.30%     
==========================================
  Files          22       23       +1     
  Lines        1245     1275      +30     
  Branches       70       70              
==========================================
+ Hits         1083     1113      +30     
  Misses         92       92              
  Partials       70       70              

Impacted Files	Coverage Δ
src/methodical/util/dispatch.clj	100.00% <100.00%> (ø)

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