Add KV store module in GO client

[0oM4R]

• Add KV store valid function in go substrate
  this will be used in V client

this may help threefoldtecharchive/substrate-client@master...implement_kvstore

[sameh-farouk]

Is this one still relevant @0oM4R @AhmedHanafy725
Do you mean tfchain-client-go ?

[AhmedHanafy725]

not sure if it's still required for the v client, but it's good to have it on the tfchain go client

[Eslam-Nawara]

WIP:
After investigation, I was able to implement set/get and delete operations.

The listing of all key-value pairs had a problem that the client used in the chain doesn't support creating/listing using partial key, so couldn't list the keys in the store

Reported here:
centrifuge/go-substrate-rpc-client#300
centrifuge/go-substrate-rpc-client#365

we will need more time to find another client or fork and update the client to support using partial keys.

[Eslam-Nawara]

Work Completed

• forked the rpc client and updated it to be able to use partial key to list all values in the store
• updated the list function to return key-value pairs with decoded format