feat: add text/plain intent to send message

[remi-espie]

This PR adds a text/plain intent that allow user to share a piece of text to a Meshtastic node through the application.

This PR is currently a WIP. As of right now, only the intent was added.

The PR idea would be 2 fold:

1. Add a way to easily share the text to a user-selected contact. For this, I thought of adding an optional txtToFill variable to the navigateToMessages function (or create a new function altogether). If not empty, this variable would autofill the text input of the selected contact.
2. Create some kind of JSON struct that would be auto parsed, like

{
"contactKey": string,
"contactName": string,
"message": string,
"autosSend": bool
}

Upon completion, this PR would solve #1062 .

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[jamesarich]

I have been thinking about this in conjunction with direct reply from the notification - I'm hoping that these would use similar methods/intents to collect and deliver to the appropriate places.

[remi-espie]

I decided to scale down this PR to solely be able to share a string of text, removing the json parser auto sending messages.
I had trouble with the auto sending of messages. It may be a part of a future PR.

This PR adds:

• the ability to share text content to a contact
• a new screen to share to
• solve [Feature Request]: Android client share feature. #1062