Add EnvHash to instance and calculate the hash based on it

[krhubert]

close #1279

It was so easy to test that with e2e!

[NicolasMahe]

It was so easy to test that with e2e!

Speaking of which, could you add a check in e2e test about the env hash calculation?

[krhubert]

I've added a transaction error log

+ return nil, fmt.Errorf("an error occurred in transaction: %s", data.TxResult.Result.Log)

Now the cli outputs:

Create service... !
 ›   Error: 2 UNKNOWN: an error occurred in transaction: 
 ›   [{"msg_index":0,"success":false,"log":"{\"codespace\":\"sdk\",\"code\":1,\"message\":\"Service.Configuration.Env[0] must be a valid 
 ›   env variable name\\nService.Configuration.Env[1] must be a valid env variable 
 ›   name\"}","events":[{"type":"message","attributes":[{"key":"action","value":"create_service"}]}]}]

I know it's not prefect error, but gives you context. Previously was:

Create service... !
 ›   Error: 2 UNKNOWN: an error occurred in transaction: 

And there was clue what's might going on.

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Now envs are stable sort.

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I've updated the validation error for env (thanks e2e tests ❤️ )

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Add e2e test for env hash.