supporting --longopt=value

Hello friends,

The curl command line parser is a custom parser that acts slightly different 
than many other command line tools.

One particular difference is how arguments to long options are provided: 
space-separated from the option itself. Like this when setting the user agent:

   curl --user-agent curl-2000 https://example.com/

Many other command line tools instead uses the equals-sign-approach, where the 
argument is instead specified immediately next to the flag like this:

   curl --user-agent=curl-2000 https://example.com/

I am now proposing a PR for curl that makes it add support for the latter 
syntax in addition to the previous, which then perhaps makes curl a bit more 
aligned with the rest of the world: https://github.com/curl/curl/pull/17789

If we deem this fine, it might be merged for the 8.16.0 release (Sep 2025).

Since this would introduce support for a syntax that is not supported by older 
curl versions, I would expect that not too many users will actually use this 
command line style for the first few years until the new parser is in more 
widespread use.

Thoughts?

-- 

  / daniel.haxx.se || https://rock-solid.curl.dev
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