Add a smart waiter for start swap method when no loaded balance

[Andrew718PLTS]

Description

During testing the all swap tests we saw that sometimes after wallet connection balance can be not loaded because of RPC - therefore we have some failures. In the scope of this ticket, it has to be handled by the waiter of loaded balance, if there is no loaded balance - we should wait for and only when it's there start the swapping execution.

Acceptance Criteria

• Start method updated with new smart waiter for loaded balance

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• Tested all new/updated changes
• Autotests passed locally
• Autotests passed on the CI
• Added/Updated a documentation

Attachments

[Andrew718PLTS]

After investigation I defined that currently we can define a connected wallet only by displayed balances of tokens from the settings popup - without custom locator there are no a valid selector to verify it. Previously, in the scope of another ticket I already added custom locators for balances.
@bayological could you tell me please when you'll release that?