feature: buffer flags

[Abdullah-Khawahir]

I am thinking of something that would lower the boilerplate and enhances the UX.

buffer flags:
curl flags at the start of the buffer to be applied across this buffer curl commands. something similar to config flags but for the buffer and it is defined somewhere in the buffer.

buffer_flag -X DELETE
buffer_flag -H 'Content-Type: application/json'
buffer_flag -d 
{
 "message":"curl.nvim is great"
}
curl http://www.postman.com

this should be equivalent to this for all the curl commands in that buffer

curl -X DELETE http://www.postman.com
-H 'Content-Type: application/json'
-d
{
 "messge":"curl.nvim is great"
}

this demo is not practical but the idea is buffer flags should be used for authentication headers or domain specific headers. those things are lengthy and ugly to look at it would be good to have them written once and forgotten about.