Rewrite the SDK

[ghost]

Hello, Pactus developers.
I wanted to use the SDK but the structure of SDK is not developer-friendly it just provides auto-generated GRPCs API and some functionality they not useful.
the point of SDKs is to create things easy to use, I want to rewrite the whole SDK to improve the structure and functionality.
I hope it is acceptable

[kehiy]

@0keeper1 Hi, that's nice too see you are interested in contributing.

Make sure you don't break current behavior or tests over all. and consider that the gRPC file at the moment have an open issue may it can affect your changes in rpc package. so, make sure you take a look at it before adding codes:

• gRPC packages and paths #19

[ghost]

@0keeper1 Hi, that's nice too see you are interested in contributing.

Make sure you don't break current behavior or tests over all. and consider that the gRPC file at the moment have an open issue may it can affect your changes in rpc package. so, make sure you take a look at it before adding codes:

* [gRPC packages and paths #19](https://github.com/pactus-project/python-sdk/issues/19)

about this issue, I will re-generate the GRPCs. and I will fix the issues.
And I will release the SDK with version 2.0.0.