fix: Ensure that SQL LIKE and ILIKE operators support multi-line matches

[alexander-beedie]

Closes #20606.

The "%" pattern in SQL LIKE and ILIKE ops is expected to match across linebreaks ¹.

Example

import polars as pl

s1 = "Hello World"
s2 = "Hello\nWorld"
s3 = "hello\nWORLD"

df = pl.DataFrame({
  "idx": [10, 20, 30],
  "txt": [s1, s2, s3],
})

🔴 Before

(linebreaks interrupt the match)

df.sql("SELECT * FROM self WHERE txt ILIKE 'Hello%'")
# shape: (1, 2)
# ┌─────┬─────────────┐
# │ idx ┆ txt         │
# │ --- ┆ ---         │
# │ i64 ┆ str         │
# ╞═════╪═════════════╡
# │ 10  ┆ Hello World │
# └─────┴─────────────┘

🟢 After

(linebreaks do not interrupt the match)

df.sql("SELECT * FROM self WHERE txt ILIKE 'Hello%'")
# shape: (3, 2)
# ┌─────┬─────────────┐
# │ idx ┆ txt         │
# │ --- ┆ ---         │
# │ i64 ┆ str         │
# ╞═════╪═════════════╡
# │ 10  ┆ Hello World │
# │ 20  ┆ Hello       │
# │     ┆ World       │
# │ 30  ┆ hello       │
# │     ┆ WORLD       │
# └─────┴─────────────┘

Aside: I think we should look at rendering "\n" in the table output here (and "\t", etc) instead of actually rendering newlines/tabs (etc) as-is. Might take a look at that later 👀

Footnotes

1. "a percent sign (%) matches any sequence of zero or more characters." (link) ↩