Add defer operator

[velialiev]

Description

https://github.com/effector/patronum/issues/329

(Why we should add this method?)

Checklist for a new method

• [x] Create a directory for the new method in the src directory in param-case
• [x] Place the source code to src/method-name/index.ts in ESModules export in camelCase named export
• [ ] Add tests to src/method-name/method-name.test.ts
• [ ] Add fork tests to src/method-name/method-name.fork.test.ts
• [ ] Add type tests to test-typings/method-name.ts
  • Use // @ts-expect-error to mark expected type error
  • import { expectType } from 'tsd' to check expected return type
• [ ] Add documentation in src/method-name/readme.md
  • Add header Patronum/MethodName
  • Add section with overloads, if have
  • Add Motivation, Formulae, Arguments and Return sections for each overload
  • Add useful examples in Example section for each overload
• [ ] Fill frontmatter in src/method-name/readme.md
  • Add title. Make sure it uses camelCase syntax just like the method itself
  • Add slug. Use param-case to write it. In most cases it will be just like title
  • Add desription with one short sentence describing what method useful for
  • Add group. To categorize method on /operators page. Full list of available groups, you can see in documentation/src/content/config.ts

[YanLobat]

My suggestion is to write test(s) And small motivation text(aka your case for example for explanation for other potential users)

P.S. yes I know that defer is a common practice but still applicable example will be very much appreciated

[sergeysova]

Added default pull request template to help making new operator