BREAKING(json): remove `json` from module names

[iuioiua]

What's changed

json has been removed from module names in @std/json. In other words:

1. @std/json/json-parse-stream has moved to @std/json/parse-stream.
2. @std/json/json-stringify-stream has moved to @std/json/stringify-stream.

Motivations

These changes were made to shorten these module specifiers while still retaining their context; that they're JSON-oriented streams.

Migration guide

To migrate:

1. Import from @std/json/parse-stream instead of @std/json/json-parse-stream.

   - import { JsonParseStream } from "@std/json/json-parse-stream";
   + import { JsonParseStream } from "@std/json/parse-stream";
   
   // ...

2. Import from @std/json/stringify-stream instead of @std/json/json-stringify-stream.

   - import { JsonStringifyStream } from "@std/json/json-stringify-stream";
   + import { JsonStringifyStream } from "@std/json/stringify-stream";
   
   // ...

---

Closes #5177.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.95%. Comparing base (b11514e) to head (05bc6da).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #5173 +/- ## ======================================= Coverage 94.95% 94.95% ======================================= Files 460 460 Lines 38073 38073 Branches 5549 5549 ======================================= Hits 36154 36154 Misses 1878 1878 Partials 41 41 ```

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