fix(falkordb): add missing special characters to sanitize method

[sgaluza]

Summary

Add forward slash (/), backslash (\), and pipe (|) to the sanitize() method to prevent RediSearch query syntax errors.

Problem

When entity names contain certain special characters, RediSearch queries fail with syntax errors. The current sanitize() method handles most special characters but misses three important ones:

Character	RediSearch Meaning	Issue
|	OR operator	Breaks query logic
\	Escape character	Causes parsing errors
/	Path separator	Causes syntax errors (see #1144)

For example, an entity name like "Cruise / En route" would produce malformed queries.

Solution

Added the three missing characters to separator_map in sanitize():

'/': ' ',   # Forward slash - causes query syntax errors
'\\': ' ',  # Backslash - escape character in RediSearch
'|': ' ',   # Pipe - OR operator in RediSearch

Also updated the docstring with:

• Reference to RediSearch escaping documentation
• Note clarifying this method is for fulltext search, not exact path matching

Research

RediSearch reserved characters that require escaping (from official docs):

• Tokenization separators: ,.<>{}[]"':;!@#$%^&*()-+=~?
• Query operators: | (OR), - (negation), * and ? (wildcards)
• Escape character: \

The existing code already handles most of these, this PR adds the missing ones.

Related

• Fixes FalkorDriver sanitize should escape forward/back slashes for RediSearch #1144
• Related to Fix FalkorDB sanitize to handle forward slash character #1118 (adds only /, this PR is more complete)

Test Plan

• Verify "Cruise / En route" → "Cruise En route"
• Verify "path\\to\\file" → "path to file"
• Verify "option1|option2" → "option1 option2"

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[danielchalef]

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[sgaluza]

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