Add conversion for ObjectRef<K> to ObjectReference

[nightkr]

This covers step 1 and 2 of #812, allowing ObjectRef objects to be used for emitting events to a Recorder.

It does not change the Recorder interface (yet), since we don't have a cheap way to convert an ObjectReference into an ObjectRef<DynamicObject> (since ApiResource requires knowing the pluralized resource name).

[codecov-commenter]

Codecov Report

Merging #815 (17bc64c) into master (fc6b8d9) will decrease coverage by 0.16%.
The diff coverage is 48.57%.

❗ Current head 17bc64c differs from pull request most recent head 3510980. Consider uploading reports for the commit 3510980 to get more accurate results

@@            Coverage Diff             @@
##           master     #815      +/-   ##
==========================================
- Coverage   69.99%   69.83%   -0.17%     
==========================================
  Files          57       57              
  Lines        3906     3938      +32     
==========================================
+ Hits         2734     2750      +16     
- Misses       1172     1188      +16     

Impacted Files	Coverage Δ
kube-runtime/src/controller/mod.rs	0.00% <0.00%> (ø)
kube-runtime/src/reflector/mod.rs	100.00% <ø> (ø)
kube-runtime/src/reflector/object_ref.rs	68.29% <51.51%> (-11.71%)	⬇️

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