PHP: Allow overwriting the quit option in emscriptenOptions

[mho22]

What is this PR doing?

Based on the issue #926

By default, even if you add a quit method in emscryptenOptions :

const php = await NodePHP.load( '8.2', { emscriptenOptions : { quit : ( status, toThrow ) => { if( status === 0 ){ process.exit() } return toThrow } } } );

it is overwritten by the actual one on line 57 in node-php.ts :

quit: function (code, error) {
	throw error;
},

This PR is moving this template callback to be overwritten by emscryptenOptions object given by user.

What problem is it solving?

To avoid throwing error from php.exit() even if it is exiting quietly.

Testing Instructions

const php = await NodePHP.load( '8.2', emscriptenOptions : { quit : ( status, toThrow ) => { if( status === 0 ){ process.exit() } return toThrow } } } );

php.exit(0);

This should display nothing.

[adamziel]

Thank you so much @mho22 !