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Adds structured outputs to chat endpoint
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Co-authored-by: Michael Yang <mxyng@pm.me>
Co-authored-by: Hieu Nguyen <hieunguyen1053@outlook.com>

Closes #7627

The writeError takes a code argument which is no longer used. Remove it for clarity.

When processing a prompt, we look for image tags of the form
[img-0], which are inserted by the Ollama server process.
However, this can cause errors if the original prompt has these
tags - typically an image not found error is returned.

This changes tag searching behavior to be similar to the 0.3.x
series, which will largely avoid these problems. However,they can
still happen when input text with these tags is used with image
models. The correct solution is to escape the tags but this is a
larger issue with special sequences in general so this is an
incremental fix that should avoid the problem for the majority
of cases.

This also makes it easier to truncate long inputs the same as
shifting but does not actually implement it. This type of
truncation has a trade off between quality and time to first
token.

This changes makeRequest to update the http client Transport if and only
if testMakeRequestDialContext is set. This is to avoid overriding the
default Transport when testMakeRequestDialContext is nil, which broke
existing behavior, included proxies, timeouts, and other behaviors.

Fixes #7829
Fixes #7788

After a user pushes their model it is not clear what to do next. Add a link
to the output of `ollama push` that tells the user where their model can now
be found.

- better formatting of input prompt
- use invoke instead of predict

If there are no avilable slots for new sequences then a request
will not be added to the processing queue but will continue on
to wait for a response that never comes. Besides never giving a
response to the request, this prevents the model from being
unloaded due to the outstanding request.

To prevent this, there are semaphores that prevent more requests
from being processed than there are slots - one in the Ollama
server and one in the runner.
 - The Ollama server one works but it is not designed to protect
the runner's data internal structures and the runner can return a
final response before clearing its data structures.
 - The internal runner semaphore has similar behavior where it
 can release the semaphore when it issues a response. This is
 wrong - it should only release the semaphore after it has
 cleared the data structure.

In addition, we should return an error if a slot is not found
rather than deadlocking in the event we ever get to this spot.

Fixes #7779

In the past the ollama.com server would return a JWT that contained
information about the user being authenticated. This was used to return
different error messages to the user. This is no longer possible since the
token used to authenticate does not contain information about the user
anymore. Removing this code that no longer works.

Follow up changes will improve the error messages returned here, but good to
clean up first.

This had fallen out of sync with the envconfig behavior, where max queue default was not zero.

Users get confused by "Failed to acquire semaphore" error="context canceled"
messages in the logs, which are actually clients giving up.  While there could be
a legitimate hang bug in the system, sometimes this is just short client timeouts
with an overloaded system, so this should help users understand what's going on
better.

This avoids emitting the progress indicators to stderr, and the interactive
prompts to the output file or pipe.  Running "ollama run model > out.txt"
now exits immediately, and "echo hello | ollama run model > out.txt"
produces zero stderr output and a typical response in out.txt