Add telegram.SetClient function

[onemedicine]

Description

Add telegram.SetClient function

Motivation and Context

Better compatibility with tgbotapi.NewBotAPIWithClient, because it allows to use a custom http.Client.

How Has This Been Tested?

No test files, no other effects.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5e9ddeb) 75.17% compared to head (d0d6f05) 75.17%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   75.17%   75.17%           
=======================================
  Files          42       42           
  Lines        1458     1458           
=======================================
  Hits         1096     1096           
  Misses        268      268           
  Partials       94       94           

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