Utils library for KAGOME and Libp2p

During internal team discussion it was decided that we need to create a separate library for common utils that are used among KAGOME, Libp2p and possible scale-codec libraries. In future we may easily extend this library, to more easily use it in our projects

Such library can include the following components:

Upgraded outcome::result

It is recognized by the team, that the way current outcome::result is used limits the ability to properly identify the source of error. Currently, it stores std::error_code inside, while internal error type could be extended to keep information such as:

Textual explanation of happened error
Location of initial error: FILE, LINE params
Context in which error happened such as input params of function that was invoked
etc...

Optional refence

Currently we manually define std::optional<std::reference_wrapper> in many places in the code. It makes sense to define an optional_reference type that would replace std::optional<std::reference_wrapper>

Buffer, BufferView, Blob

Hex utils

Literals

Literals from common/literals testutil/literals

qdrvm / kagome