feat(core)!: merge MaskitoElementPredicate & MaskitoElementPredicateAsync into single type

[nsbarsukov]

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactoring
• Build or CI related changes
• Tests related changes
• Documentation content changes

What is the current behaviour?

@maskito/core source code:

export type MaskitoElementPredicate = (
    element: HTMLElement,
) => HTMLInputElement | HTMLTextAreaElement;

export type MaskitoElementPredicateAsync = (
    element: HTMLElement,
) => Promise<HTMLInputElement | HTMLTextAreaElement>;

---

Your code:

import {
    MaskitoElementPredicate,
    MaskitoElementPredicateAsync,
} from '@maskito/core';

const syncPredicate: MaskitoElementPredicate = element =>
    element.querySelectorAll('input')[1]!;

const asyncPredicate: MaskitoElementPredicateAsync = async element =>
    Promise.resolve(element.querySelectorAll('input')[1]!);

What is the new behaviour?

@maskito/core source code:

export type MaskitoElementPredicate = (
    element: HTMLElement,
) =>
    | HTMLInputElement
    | HTMLTextAreaElement
    | Promise<HTMLInputElement | HTMLTextAreaElement>;

---

Your code:

import {MaskitoElementPredicate} from '@maskito/core';

const syncPredicate: MaskitoElementPredicate = element =>
    element.querySelectorAll('input')[1]!;

const asyncPredicate: MaskitoElementPredicate = async element =>
    Promise.resolve(element.querySelectorAll('input')[1]!);

Closes #607

[github-actions]

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