feat: introduce matches_term function

[zhongzc]

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What's changed and what's your intention?

Function description

/// Exact term/phrase matching function for text columns.
///
/// This function checks if a text column contains exact term/phrase matches
/// with non-alphanumeric boundaries. Designed for:
/// - Whole-word matching (e.g. "cat" in "cat!" but not in "category")
/// - Phrase matching (e.g. "hello world" in "note:hello world!")
///
/// # Signature
/// `matches_term(text: String, term: String) -> Boolean`
///
/// # Arguments
/// * `text` - String column to search
/// * `term` - Search term/phrase
///
/// # Returns
/// BooleanVector where each element indicates if the corresponding text
/// contains an exact match of the term, following these rules:
/// 1. Exact substring match found
/// 2. Match boundaries are either:
///    - Start/end of text
///    - Non-alphanumeric characters
///
/// # Examples
/// ```
/// -- SQL examples --
/// -- Match phrase with space --
/// SELECT matches_term(column, 'hello world') FROM table;
/// -- Text: "warning:hello world!" => true
/// -- Text: "hello-world"          => false (hyphen instead of space)
/// -- Text: "hello world2023"      => false (ending with numbers)
///
/// -- Match multiple words with boundaries --
/// SELECT matches_term(column, 'critical error') FROM logs;
/// -- Match in: "ERROR:critical error!"
/// -- No match: "critical_errors"

Utilize a bloom filter as the backend of a fulltext index to enhance the performance of the matches_term function.

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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