HTTP has a 128 MB limit, while websock uses the library default (20 MB).
Align both to 128 MB. This should be enough for an Ethereum `getPayload`
with 6 blobs, all hex encoded binary + JSON overhead.
* Upgrade rpc router internals
* use new chronos asyncraises
* Fix style mismatch
* Fix nim v2 compilation error
* Addresing review
* Remove unnecessary custom serializer and let the library do the work
* fix error message
* Update readme.md