feat: Add missing fields for AccountUpdateTransaction

[emiliyank]

Description:
Add missing fields for AccountUpdateTransaction class

Fixes #801

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[nadineloepfe]

LGTM, quick change of Changelog and then that's ready to go! Thank you

[exploreriii]

Request review @manishdait @nadineloepfe if able

[manishdait]

Seems good to me

[exploreriii]

Thanks Manish. @emiliyank please rebase when able 👍

[nadineloepfe]

rebase please and then that's ready to go @emiliyank

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[exploreriii]

sorry for the spam, there is something going on with our tests.

[exploreriii]

Hi @emiliyank please rebase to pull in main's changes, we applied a fix that was blocking our tests.

[exploreriii]

https://github.com/hiero-ledger/hiero-sdk-python/pull/837/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4edL45

Please add back in line 45

• Added examples/token_create_transaction_supply_key.py to demonstrate token creation with and without a supply key.

additionally please move

• Add max_automatic_token_associations, staked_account_id, staked_node_id and decline_staking_reward fields to AccountUpdateTransaction (#801)
  to rouhgly line 11

Your changelog needs updating becaues we did a new release 👍

[exploreriii]

Hi @emiliyank reminder to rebase when you are able and move your changelog entry to the UNRELEASED section
Thank you

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