Add module.loaded, and module.require should not be enumerable

[SimenB]

Summary
As mentioned in #4614 (comment) there are 2 ways that module in normal node and module in jest diverge (at the top level, #4614 addresses module.parent being faked).

1. module.requireshould not be enumerable.
2. module.loaded is missing in jest's implementation. (https://nodejs.org/api/modules.html#modules_module_loaded)

This PR fixes both of those issues.

Test plan
New test added

[SimenB]

This should be type Module = typeof module to get the type definitions from flow itself (it would have yelled at us for missing loaded, for instance). A bit more work though as it also doesn't like that require is added the way it is in this PR. Can revisit later

[codecov-io]

Codecov Report

Merging #4623 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #4623      +/-   ##
=========================================
+ Coverage   56.18%   56.2%   +0.01%     
=========================================
  Files         194     194              
  Lines        6546    6548       +2     
  Branches        3       3              
=========================================
+ Hits         3678    3680       +2     
  Misses       2867    2867              
  Partials        1       1

Impacted Files	Coverage Δ
packages/jest-runtime/src/index.js	85.21% <100%> (+0.11%)	⬆️

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[cpojer]

please rebase :)

[SimenB]

Rebased!

[github-actions]

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