Adding test files

tests/data/groundtruth/docling_v2/equations.docx.itxt

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+item-0 at level 0: unspecified: group _root_
+  item-1 at level 1: paragraph: This is a word document and this ... nt an equation by line, I can do this:
+  item-2 at level 1: paragraph: 
+  item-3 at level 1: paragraph: $a^{2}+b^{2}=c^{2} \text{ \texttimes } 23$
+  item-4 at level 1: paragraph: And that is an equation by itself. Cheers!
+  item-5 at level 1: paragraph: 
+  item-6 at level 1: paragraph: This is another equation:
+  item-7 at level 1: paragraph: $f\left(x\right)=a_{0}+\sum_{n=1 ... )+b_{n}\sin(\frac{n \pi x}{L})\right)$
+  item-8 at level 1: paragraph: 
+  item-9 at level 1: paragraph: This is text. This is text. This ... s is text. This is text. This is text.
+  item-10 at level 1: paragraph: 
+  item-11 at level 1: paragraph: 
+  item-12 at level 1: paragraph: This is a word document and this ... nt an equation by line, I can do this:
+  item-13 at level 1: paragraph: 
+  item-14 at level 1: paragraph: $\left(x+a\right)^{n}=\sum_{k=0} ... c{}{}{0pt}{}{n}{k}\right)x^{k}a^{n-k}$
+  item-15 at level 1: paragraph: 
+  item-16 at level 1: paragraph: And that is an equation by itself. Cheers!
+  item-17 at level 1: paragraph: 
+  item-18 at level 1: paragraph: This is another equation:
+  item-19 at level 1: paragraph: 
+  item-20 at level 1: paragraph: $\left(1+x\right)^{n}=1+\frac{nx ... t)x^{2}}{2!}+ \text{ \textellipsis } $
+  item-21 at level 1: paragraph: 
+  item-22 at level 1: paragraph: This is text. This is text. This ... s is text. This is text. This is text.
+  item-23 at level 1: paragraph: 
+  item-24 at level 1: paragraph: 
+  item-25 at level 1: paragraph: This is a word document and this ... nt an equation by line, I can do this:
+  item-26 at level 1: paragraph: 
+  item-27 at level 1: paragraph: $e^{x}=1+\frac{x}{1!}+\frac{x^{2 ... ellipsis } , - \infty  < x <  \infty $
+  item-28 at level 1: paragraph: 
+  item-29 at level 1: paragraph: And that is an equation by itself. Cheers!
+  item-30 at level 1: paragraph: