`@sapui5/ts-types-esm` - `PageObjectDefinition.actions` & `assertions` function types should have a `this` parameter

[DetachHead]

export type PageObjectDefinition = {
    //...
    actions?: Record<string, (this: Opa5) => void>;
    assertions?: Record<string, (this: Opa5) => void>;
}

otherwise this example won't compile bcause the this type is not defined:

Opa5.createPageObjects({
    onTheAppPage: {
        actions: {},

        assertions: {
            iShouldSeeTheApp: function () {
                // error: Cannot invoke an object which is possibly 'undefined'
                this.waitFor({
                    id: 'myButton',
                    actions: function () {},
                    success: function () {},
                })
            },
        },
    },
})

[petermuessig]

Same like #306 - testing related code wasn't in focus of TS API support so far.