Add `unsafe-to-chain-command` exception for `cy.wait` command when used with alias.

[patrickcate]

As mentioned in #127 (comment), one exception to the unsafe-to-chain-command rule is cy.wait when used with an alias:

// Example: assert status from cy.intercept() before proceeding
cy.wait('@alias').its('response.statusCode').should('eq', 200)

Currently the unsafe-to-chain-command is turned off for all cy.wait commands. Instead it would be most useful if the rule was applied for cy.wait commands unless they as used with an alias.

Example:

// BAD
cy.wait(5000);

// GOOD
cy.wait('@alias');

[nagash77]

@patrickcate thank you for entering your request. We will review your request internally and decide if this is something we would be interested in implementing.

[brandonb927]

Came here and found this issue because my team also ran into a situation like this where I'm trying to enforce better practices of using aliases for wait rather than hard-coded numbers. I would love to be able to add a warning for the pattern of wait(Number) instead of wait(String).