Introduce Runtime trait and type

[jbr]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.76471% with 96 lines in your changes are missing coverage. Please review.

Project coverage is 52.27%. Comparing base (63e23d1) to head (257b7d1).
Report is 1 commits behind head on 0.3.x.

Files	Patch %	Lines
testing/src/runtimeless/runtime.rs	61.53%	15 Missing ⚠️
tokio/src/runtime.rs	63.63%	12 Missing ⚠️
server-common/src/runtime.rs	62.06%	11 Missing ⚠️
async-std/src/runtime.rs	60.00%	8 Missing ⚠️
smol/src/server/tcp.rs	0.00%	8 Missing ⚠️
smol/src/runtime.rs	73.07%	7 Missing ⚠️
testing/src/runtimeless/server.rs	80.00%	6 Missing ⚠️
server-common/src/runtime/object_safe_runtime.rs	50.00%	4 Missing ⚠️
tokio/src/server/tcp.rs	0.00%	4 Missing ⚠️
async-std/src/server/tcp.rs	0.00%	3 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##            0.3.x     #641      +/-   ##
==========================================
+ Coverage   51.54%   52.27%   +0.72%     
==========================================
  Files         184      194      +10     
  Lines        7209     7331     +122     
==========================================
+ Hits         3716     3832     +116     
- Misses       3493     3499       +6     

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