[5.x] Remove the ability to extends the internal Command class

[5.x] Add declare(strict_types=1)

… add ability to use uri and text to InputFile

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[5.x] Refactor InputFile and OutgoingResource

[5.x] Add support to ChatFullInfo type

[5.x] Add support for ApiException instance

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[5.x] Psalm Level 6

…andler class

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… for command descriptions

# Conflicts:
#	src/Telegram/Types/Chat/Chat.php

[5.x] Add ability to declare a description to an handler

# Conflicts:
#	src/Telegram/Types/Chat/Chat.php

[5.x] Psalm Level 5

# Conflicts:
#	src/Telegram/Types/Input/InputSticker.php
#	tests/Feature/ConversationTest.php
#	tests/Fixtures/Cache/TestCache.php

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[5.x] Add ClockInterface support