Additional fields on "AccountOnNetwork"

[andreibancioiu]

See:

• https://api.multiversx.com/accounts/erd1qqqqqqqqqqqqqpgqvc7gdl0p4s97guh498wgz75k8sav6sjfjlwqh679jy
• https://gateway.multiversx.com/address/erd1qqqqqqqqqqqqqpgqvc7gdl0p4s97guh498wgz75k8sav6sjfjlwqh679jy

code_hash and root_hash are base64-encoded, which is somehow unfortunate. Their encoding wasn't changed to hex, in order to avoid a breaking change.

[github-actions[bot]]

Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
multiversx_sdk/network_providers
accounts.py					65, 91-93
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