Add vision support to rust openai proxy server

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

See https://bixense.com/clicolors/

V7 UUIDs include a timestamp and are sortable. This is useful to see which ID is newer.

We don't want to include it for e.g. the `dora-node-api-c`.

Allows overriding the working directory per node.

The dataflow descriptor format still changes often, which led to parse errors. By doing the parsing lazily, this should only affect users of the `dataflow_descriptor` function from now on.

fix: logging thread block

for better error messages

Instead of sending `CoordinatorStopped`.

This should make it easier to debug when a reply is not sent as expected.

The coordinator now sends an immediate `DataflowStartTriggered` reply when receiving a `DataflowStart` command. This enables the CLI to directly attach to the dataflow and observe the build output.

To wait until the build/spawning is done, this commit introduces a new `WaitForSpawn` command, to which the coordinator replies with a `DataflowSpawned` message once the node has been started. We use this command for the `dora build` command.

Instead of running all the build commands directly, run them on their intended target machines through the coordinator.

This commit is a breaking change because a coordinator connection is now required for `dora build`.

Fixes the tests/examples of this repo. A UNC path as working directory doesn't work because the build commands of our examples invoke `cargo` on the dora repo. The dora repo uses wildcards in the member list in the top-level Cargo.toml, which are ignored in UNC-paths. Thus, `failed to load manifest for workspace member` errors occur.

Co-authored-by: Haixuan Xavier Tao <tao.xavier@outlook.com>