Allow chat streaming to use tools

[Jeadie]

Description

• Add tool_calls to .chunk.delta within ChatCompletionChunkResponse (i.e. /v1/chat/completion streaming).
• This is done by checking whether the stream could be parsed to the tool call structure (could be meaning that we'd get an EOF, not a format error, when parsing it to a tool structure).

[github-actions]

Code Metrics Report

  ===============================================================================
 Language            Files        Lines         Code     Comments       Blanks
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 C Header                2           35           28            0            7
 Dockerfile              1           41           22           10            9
 JSON                   12          105          104            0            1
 Python                 69         2926         2534           77          315
 Shell                   1           58           22           18           18
 Plain Text              3         3723            0         2413         1310
 TOML                   18          645          574            2           69
 YAML                    2           21           19            2            0
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 Jupyter Notebooks       4            0            0            0            0
 |- Markdown             2           77           32           31           14
 |- Python               2          205          178            1           26
 (Total)                            282          210           32           40
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 Markdown               47         3826            0         2907          919
 |- BASH                 6          103          100            0            3
 |- JSON                 1           12           12            0            0
 |- Python               7          121          109            0           12
 |- Rust                15          512          433            0           79
 |- TOML                 2           75           63            0           12
 (Total)                           4649          717         2907         1025
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 Rust                  311       100379        89907         2007         8465
 |- Markdown           151         1702           25         1552          125
 (Total)                         102081        89932         3559         8590
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 Total                 470       111759        93210         7436        11113
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[EricLBuehler]

Thanks for the PR! Just a small comment.