feat(doc-intel): expose model_id and analysis features on DocumentIntelligenceConverter (#2273)

[Tai An (Anai-Guo)]

Closes #2273.

Problem

DocumentIntelligenceConverter hardcodes both the analysis model and the add-on
feature set:

poller = self.doc_intel_client.begin_analyze_document(
    model_id="prebuilt-layout",
    ...
    features=self._analysis_features(stream_info),   # always FORMULAS + OCR_HIGH_RESOLUTION + STYLE_FONT
)

There is no constructor parameter for either, so a caller who only needs plain
text OCR has no way to ask for prebuilt-read or to drop the add-ons short of
bypassing MarkItDown and calling azure-ai-documentintelligence directly. As
#2273 notes, on Azure pay-as-you-go that is roughly a 10–19× cost difference
(~$1.50 vs ~$16–28 per 1,000 pages).

Change

Two new keyword-only parameters on DocumentIntelligenceConverter, plumbed
through MarkItDown(...) following the existing docintel_* kwargs pattern:

parameter	MarkItDown kwarg	default	meaning
model_id: str	docintel_model_id	"prebuilt-layout"	model passed to begin_analyze_document
features: List[str] | None	docintel_features	None	None keeps today's add-on set; [] disables all add-ons

md = MarkItDown(
    docintel_endpoint=...,
    docintel_model_id="prebuilt-read",
    docintel_features=[],
)

The defaults are the current values, so existing callers send byte-identical
requests. This exposes the choice rather than changing it, as the issue asks.

Two behaviours are deliberately preserved:

• Office types still get no add-ons. The .docx/.pptx/.xlsx/.html early
  return runs before the new branch, because the service does not accept add-ons
  for those types — an explicit features=[...] cannot re-introduce a request
  the API would reject.
• The caller's list is copied, not aliased into the request.

Tests

New packages/markitdown/tests/test_docintel_options.py (8 tests), built with
the same __new__ no-Azure-client pattern as the existing
test_docintel_html.py.

Run against the released package with the patch applied and removed:

# unpatched: the two tests that assert the new behaviour fail, the
# "defaults unchanged" guards pass
2 failed, 6 passed

# patched
8 passed

test_docintel_html.py still passes (2 passed), and black==23.7.0 (the pinned
pre-commit version) reports all three touched files unchanged.

Plumbing verified end to end:

custom  model_id = prebuilt-read   | features = []
default model_id = prebuilt-layout | features = ['formulas', 'ocrHighResolution', 'styleFont']

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