In order to make debugging easier, I have made it possible from multiple
node to retrieve the urdf given the robot_descriptions handler example:
`so_arm101_description` this makes it easier to download and load them
at runtime.

I have added example within `examples/urdf` 

If you have time, I would love if you could take a look: @ShashwatPatil
and try the examples.

This PR adds vision to rust openai proxy server

Adds support for fetching nodes from git repositories through new `git`,
`branch`, `tag`, and `rev` keys in the dataflow YAML file.


**Note:** This PR updates the dataflow descriptor format and the format
of the messages sent between components. This means that users need to
update the `dora daemon`/`dora coordinator`, `dora cli`, and dora node
API in sync in order to use it.

This PR makes it possible for nodes to stop when all input is closed.
This is necessary because when merging two different event stream and we
want to stop when all event from dora finishes we can rely on the stop
messages to stop.

It also removes the complexity of the event stream code.

Avoids stack overflows on Windows

Reverts dora-rs/dora#1025

Add vision support to rust openai proxy server

Send the log messages back to the CLI instead of logging them through tracing at the `daemon` level.

Ensures that `log::info` etc messages are logged too.

Add vggt support within dora

Parentheses in directory names confuse some build tools/scripts (e.g. openssl Makefile).

See https://bixense.com/clicolors/

Quick failures might occur before the CLI even sent the `WaitForBuild` message

The file stores local state and should not be commited to git repositories. By adding the file to a `.gitignore` we can avoid this.

Creates a new local `.gitignore` file if none exists. Otherwise, it appends the file to the existing `.gitignore` file.

@ShashwatPatil I have made some overall improvement.

Could you check the commits and see if its ok for you to merge?