Flow Rust SDK Milestone 3

[MarshallBelles]

Flow-Rust-SDK - Milestone 3

This PR is for issue #20.

Milestone 3 Completion:

• 3 [x] Meet and exceed Flow SDK guidelines

The Flow SDK Guidelines are defined here.

Each of the provided stories have examples:

Blocks:

• Retrieve a block by ID
• Retrieve a block by height
• Retrieve the latest block

Collections:

• Retrieve a collection by ID

Events:

• Retrieve events by name in the block height range

Scripts:

• Submit a script and parse the response
• Submit a script with arguments and parse the response

Accounts:

• Retrieve an account by address
• Create a new account
• Deploy a new contract to the account
• Remove a contract from the account
• Update an existing contract on the account

Transactions:

• Retrieve a transaction by ID
• Sign a transaction (single payer, proposer, authorizer or combination of multiple)
• Submit a signed transaction
• Sign a transaction with arguments and submit it

Authors include:

@marshallbelles
@bluesign

[MarshallBelles]

@sideninja all squared away here as well.

[kerrywei]

merging in this PR given the milestone has been achieved