Update parameter types according to API docs

[lethaale]

https://api.docs.extended.exchange/#get-trades
params market is not required => set as Optional

https://api.docs.extended.exchange/#get-fees
params market is not required => set as Optional

https://api.docs.extended.exchange/#get-current-leverage
params market is not required => set as Optional

https://api.docs.extended.exchange/#get-candles-history
params limit is required => removed Optional

[Copilot]

Pull request overview

This pull request updates parameter types in several API client methods to align with the official Extended Exchange API documentation. The changes make optional parameters that were incorrectly marked as required, and mark one previously optional parameter as required according to the API specification.

Changes:

• Updated get_candles_history to make the limit parameter required (removed Optional)
• Updated get_trades, get_fees, and get_leverage to make the market_names parameter optional
• Added a helpful comment in an example file suggesting testnet configuration option

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
x10/perpetual/trading_client/markets_information_module.py	Made limit parameter required in get_candles_history method
x10/perpetual/trading_client/account_module.py	Made market_names parameter optional in get_trades, get_fees, and get_leverage methods
examples/01_create_limit_order.py	Added clarifying comment about testnet configuration option

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