add new method for Router

[sheldygg]

Description

Added a method that allows you to compactly register routers

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Documentation (typos, code examples or any documentation update)

How has this been tested?

Type here...

Test Configuration

• Operating system: Windows 10
• Python version: 3.10.9

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works as expected
• New and existing unit tests pass locally with my changes
• My changes generate no new warnings or errors
• My changes are compatible with minimum requirements of the project
• I have made corresponding changes to the documentation

[github-actions]

✔️ Changelog found.

Thank you for adding a description of the changes

[codecov]

Codecov Report

Merging #1117 (9550f6a) into dev-3.x (e8d279c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           dev-3.x     #1117   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          340       340           
  Lines         8829      8834    +5     
=========================================
+ Hits          8829      8834    +5     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiogram/dispatcher/router.py	100.00% <100.00%> (ø)