Add tests for pipe tables with code spans containing pipes (issue #29)

These tests verify that the parser correctly handles code spans containing
pipe characters within pipe tables. The fix in the block parser now properly
parses code spans to avoid treating pipes inside backticks as table
delimiters.

Test cases cover:
- Simple code span with single pipe
- Multiple code spans with pipes in different cells
- Mixed backtick delimiters (double and triple backticks)

All tests pass and match Pandoc's output.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: cscheid

crates/quarto-markdown-pandoc/tests/pandoc-match-corpus/markdown/pipe-table-code-span.qmd

@@ -0,0 +1,3 @@
+| a | b |
+|---|---|
+| `|` | oh no |

crates/quarto-markdown-pandoc/tests/pandoc-match-corpus/markdown/pipe-table-mixed-backticks.qmd

@@ -0,0 +1,5 @@
+| Test | Description |
+|------|-------------|
+| `` ` `` | backtick in code |
+| ``` | ``` | pipe in triple backtick code |
+| `a|b|c` | multiple pipes |

crates/quarto-markdown-pandoc/tests/pandoc-match-corpus/markdown/pipe-table-multiple-code-spans.qmd

@@ -0,0 +1,5 @@
+| Column 1 | Column 2 | Column 3 |
+|----------|----------|----------|
+| `|` | normal text | `a|b` |
+| regular | `||` | more text |
+| `x | y` | text | `|>` |