Add --text-file option

[zmoog]

Motivation

We want to load the message text from the file, for example:

tgm message send --chat-id 123456 --text-file message.txt

Optionally, user can use the path "-" to load the message from the std instead.

For example:

# use `<`
tgm message send --chat-id 123456 < message.txt

# or use `|`
cat message.txt | tgm message send --chat-id 123456
# or
echo "hey dude, it's me again" | tgm message send --chat-id 123456

# or type your message and send it by typing `CTRL+D`
tgm message send --chat-id 123456
Hey dude, yeah it's me again!
<CTRL+D>

Change description

Load the text message from a stream. The stream can be a file or the stdin.

Additional Notes

Close zmoog/public-notes#4

Reviewer checklist

• PR address a single concern.
• PR title and description are appropriately filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.
• Docs are updated (at least the README.md, if needed).
• History is clean, commit messages are meaningful (see CONTRIBUTING.md) and are well-formatted.