Re: [whatwg/fetch] Define the "Preload Cache" (#590)

I created a table summarizing the current browser behavior, based on [this test](https://github.com/web-platform-tests/wpt/pull/30981).

The test fetches different resources with different response types (Cache enabled/disabled or 404 error).
The values in the table mean the following:
- *None*: preloaded resource is not reused.
- *Multiple*: preloaded resource is used for subsequent requests.
- *Once*: preloaded resource is used for one subsequent request, the next one will re-fetch the resource.

<table>
<thead>
 <td>Resource
 <td>Response
 <td>Chrome
 <td>Firefox
 <td>Safari
<tbody>
  <tr>
    <td rowspan="3">Fetch
    <td>Cache <td>Multiple <td rowspan="3">None <td>Multiple
   <tr>
    <td>No Cache
    <td rowspan="2">None <td rowspan="2">None
  <tr>
     <td>Error

  <tr>
    <td rowspan="3">Fetch with `force-cache`
    <td>Cache
    <td colspan="3">Multiple
   <tr>
    <td>No Cache
    <td colspan="3">None
  <tr>
     <td>Error
    <td colspan="2">Multiple
    <td>Ignore

  <tr>
    <td rowspan="3">Valid image
    <td>Cache
    <td rowspan="2">Once <td rowspan="2" colspan="2">Multiple
   <tr>
    <td>No Cache
  <tr>
     <td>Error
    <td>Multiple <td>Once <td>Multiple

  <tr>
    <td rowspan="3">Invalid image
    <td>Cache
    <td>Multiple <td> Once <td> Multiple
   <tr>
    <td>No Cache
    <td colspan="2" rowspan="2">Once <td rowspan="2"> None
   <tr>
    <td>Error

  <tr>
    <td rowspan="3">Script
    <td>Cache
    <td>Multiple <td> Once <td rowspan="3">Multiple
   <tr>
    <td>No Cache
    <td colspan="2">Once
   <tr>
    <td>Error
    <td colspan="2">None

  <tr>
    <td rowspan="3">Style
    <td>Cache
    <td colspan="3">Multiple
   <tr>
    <td>No Cache
    <td>Once
    <td colspan="2">Multiple
   <tr>
    <td>Error
    <td colspan="2">None
    <td>Multiple
</table>

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