Add Di::set() instance binding support to DI container

[armanist]

Closes #413

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.48%. Comparing base (12a4b1f) to head (0b0f4dd).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #414      +/-   ##
============================================
+ Coverage     81.46%   81.48%   +0.02%     
- Complexity     2685     2691       +6     
============================================
  Files           239      239              
  Lines          7147     7157      +10     
============================================
+ Hits           5822     5832      +10     
  Misses         1325     1325              

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