feat(function): Add tool streaming, XML Tool Call Parsing Support (#7865)

* feat(function): Add XML Tool Call Parsing Support

Extend the function parsing system in LocalAI to support XML-style tool calls, similar to how JSON tool calls are currently parsed. This will allow models that return XML format (like <tool_call><function=name><parameter=key>value</parameter></function></tool_call>) to be properly parsed alongside text content.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* thinking before tool calls, more strict support for corner cases with no tools

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Support streaming tools

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Iterative JSON

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Iterative parsing

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Consume JSON marker

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Fixup

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* add tests

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Fix pending TODOs

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

* Don't run other parsing with ParseRegex

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

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Signed-off-by: Ettore Di Giacinto <mudler@localai.io>