converting stream to buffer when uploading files without apparent need

[erickythierry]

the conversion is only being carried out to check the file size and compare it with the maximum size limit of the upload hosts. However, these hosts are returning null in the maxContentLengthBytes field, because of this, the code becomes useless and generates a problem of intense RAM usage without need in cases of sending large files.

I modified it to remove the size check (since it will never be checked since the value is null)
and I passed the stream directly to the axios request, so the file will be sent in stream mode, saving RAM

[whiskeysockets-bot]

Thanks for your contribution.

The next step is to wait for review and approval to merge it to main repository

The community can help reacting with a thumb up (:thumbsup:) for approval and rocket (:rocket:) for who has tested it.

To test this PR you can run the following command below:

# NPM
npm install @whiskeysockets/baileys@erickythierry/Baileys#master
# YARN v2
yarn add @whiskeysockets/baileys@erickythierry/Baileys#master

[azudindaem]

lgtm