* fix(gateway): do not convert unixfs/raw into dag-* unless explicit
* fix(gateway): keep only dag-json|dag-cbor handling
* fix: allow requesting dag-json as application/json
- adds bunch of additional tests including JSON file on UnixFS
- fix: dag-json codec (0x0129) can be returned as plain json
- fix: json codec (0x0200) cna be retrurned as plain json
* fix: using ?format|Accept with CID w/ codec works
* docs(changelog): cbor and json on gateway
Co-authored-by: Marcin Rataj <lidel@lidel.org>
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