fix: parameterized disable_numparse for MarkdownTableSerializer

[lucaselvaggio]

This change introduces the disable_table_numparse parameter to MarkdownParams, enabling it to be passed through to the export_to_markdown function.
When set to True, this flag is forwarded to the tabulate function via disable_numparse, preventing automatic numeric parsing.

Previously, numeric values containing trailing zeros (e.g. "50.000") were automatically parsed and reformatted (e.g. to "50"), resulting in loss of precision in the Markdown table output. With this change, setting disable_table_numparse=True preserves the original formatting of numeric strings during Markdown export.

Issue ref: docling-project/docling#1891

By exposing this parameter, the implementation provides greater flexibility for different usage scenarios where numeric formatting preservation is required.

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