Add multiple text filter

[Birdi7]

Description

Add the multiple text filter as required at #151, Multiple text filter (aiogram_ru#73126).
The following patterns are applied for comparison methods:

• equals - True if any of strings in the list is equal to the text
• contains - True if the text contains all strings from the list. Reason: There is no way to do such comparison right now (except using custom filters), while the condition "if the text contains any string" can be implemented with a bunch of register_message_handler
• startswith - True if text starts with any string from the list. Reason: There is no need to implement "if text starts with all strings from the list" as all prefixes can be mixed in one
• endswith - True if text ends with any string from the list. Reason: There is no need to implement "if text ends with all strings from the list" as all postfixes can be mixed in one

Tests are included for all methods. An example of usage was added.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

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

[mahenzon]

Your ANY filters are redundant because the same result can be achieved by adding multiple registrators

Maybe only the contains all of the entries has its place

You have the same code in your example

@dp.message_handler(text_contains='spam')
@dp.message_handler(text_contains='eggs')
await def my_handler(message):
    await foobar()

[Birdi7]

@surik00 yes, they may be replaced with a bunch of registrations. Although, my filters make code clearer and more readable while don't break the existing code written using previous filters. Command filter works the same way, and it take place in aiogram

[JrooTJunior]

You marked item "I have made corresponding changes to the documentation" as completed but don't add any information to the documentations.

Please add information described in this PR to the docs/source/dispatcher/filters.rst

[JrooTJunior]

I'll uncheck documentation mark until you don't update the documentations.

[Birdi7]

@JrooTJunior I added the docs in the last 2 commits. Here is the built version of docs for this branch