Add a 'Replace unused destructured parameter with _' quick fix

[mjbvz]

From microsoft/vscode#76583

TypeScript Version: typescript@3.6.0-dev.20190704

Search Terms:

• quick fix
• remove destructuring
• parameter
• function

Code

function f({x}, y) { return y; }

Trigger quick fixes on {x}

Bug:
A quick fix which removes the destructing is returned, but there is no quick fix to convert the first paramter to a _. Replacing a parameter with _ is available for normal parameters:

function f(x, y) { return y; }

[RyanCavanaugh]

@mjbvz seems like the OP is a complaint that we broke their code by observably changing the function parameter ordering

Changing { x } to _ has observable runtime effects (calling with null no longer throws, for example). We should change it to { } and leave it alone after that; I don't see any benefit to changing it to _ - it just creates new scope pollution

[infinnie]

Perhaps related: #32196