Hide Simmy API for initial v8 release

[martintmk]

Details on the issue fix or feature implementation

This PR hides API introduced by #1459.

The reason for this is that current API is already reviewed and Polly v8 is to be released soon after #1091 is done.
Once #1571 is approved we can unhide the API and release it in 8.1

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7cc2ea1) 84.63% compared to head (fe99ffb) 84.63%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1601   +/-   ##
=======================================
  Coverage   84.63%   84.63%           
=======================================
  Files         306      306           
  Lines        6820     6820           
  Branches     1044     1044           
=======================================
  Hits         5772     5772           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	?
macos	84.63% <ø> (ø)
windows	84.63% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...lly.Core/Simmy/Behavior/BehaviorActionArguments.cs	100.00% <ø> (ø)
...immy/Behavior/BehaviorPipelineBuilderExtensions.cs	100.00% <ø> (ø)
...lly.Core/Simmy/Behavior/BehaviorStrategyOptions.cs	100.00% <ø> (ø)
...Core/Simmy/Behavior/OnBehaviorInjectedArguments.cs	100.00% <ø> (ø)
src/Polly.Core/Simmy/EnabledGeneratorArguments.cs	100.00% <ø> (ø)
...olly.Core/Simmy/InjectionRateGeneratorArguments.cs	100.00% <ø> (ø)
...ly.Core/Simmy/Latency/LatencyGeneratorArguments.cs	100.00% <ø> (ø)
.../Simmy/Latency/LatencyPipelineBuilderExtensions.cs	100.00% <ø> (ø)
...Polly.Core/Simmy/Latency/LatencyStrategyOptions.cs	100.00% <ø> (ø)
src/Polly.Core/Simmy/Latency/OnLatencyArguments.cs	100.00% <ø> (ø)
... and 11 more

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[martintmk]

cc @vany0114

[vany0114]

🙏 I'll work thru the #1571 feedback and also this comment as soon as I can.