Add createRequestContext and createRenderContext functions

[ganemone]

These functions can be useful when trying to test middleware or APIs which rely on a context object. Usage example:

import {createRequestContext, createRenderContext} from 'fusion-test-utils';
const ctx = createRenderContext('/')
const ctx2 = createRequestContext('/', {method: 'POST'});
// ... etc

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@25cbc33). Click here to learn what that means. The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #182   +/-   ##
=========================================
  Coverage          ?   87.01%           
=========================================
  Files             ?        3           
  Lines             ?       77           
  Branches          ?       14           
=========================================
  Hits              ?       67           
  Misses            ?        8           
  Partials          ?        2

Impacted Files	Coverage Δ
src/index.js	70% <ø> (ø)
src/simulate.js	100% <100%> (ø)
src/mock-context.js	96.55% <100%> (ø)

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[ganemone]

!merge