Feature: Client functionalities

[ghost]

The goal of this PR is to add many functionalities to this sdk, so it comes closer to the js-sdk. So far, the following functionalities are implemented:

Item	Arweave	Solana	Ethereum	ERC20	Cosmos	Aptos
Balance	[x]	[x]	[x]	[ ]	[ ]	[ ]
Price	[x]	[x]	[x]	[ ]	[ ]	[ ]
Fund	[x]	[ ]	[ ]	[ ]	[ ]	[ ]
Withdraw	[x]	[ ]	[ ]	[ ]	[ ]	[ ]
Upload	[x]	[x]	[x]	[ ]	[ ]	[ ]
Upload Directory	[ ]	[ ]	[ ]	[ ]	[ ]	[ ]

Examples of usage can be found in examples/directory, and details of client usage can be found in the readme.

[JesseTheRobot]

Quick update: Aptos (single and multisig) are now merged into main in the JS SDK (and Arbundles)

[ghost]

Quick update: Aptos (single and multisig) are now merged into main in the JS SDK (and Arbundles)

Alright, I'll update the readme Roadmap status with aptos column

[mikonieminen]

Pretty massive change, but looks mostly fine, just one comment for future development and minor change.