[pull] main from nalgeon:main

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.1)

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Summary by Sourcery

Prevent crashes when handling empty fields in CSV rows and add error handling for calling defined functions after they have been freed.

New Features:

• Add error handling to prevent crashes when calling defined functions after they have been freed.

Tests:

• Handle empty fields at the beginning of CSV rows.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces several key enhancements: improvements to cache management in defined functions with additional state tracking, updates to the README documentation regarding support and copyright information, and a fix in the extension module to handle empty fields correctly.

State Diagram for Cache Management in Defined Functions

stateDiagram-v2
    [*] --> Active: Initialize (cache_freed = false)
    Active --> Executing: Call define_exec()/define_function()
    note right of Active: Normal execution returns success
    Executing --> Active: Execution complete
    Active --> Freed: Call cache_free()
    Freed --> Error: Any call to define_exec()/define_function()
    note right of Freed: Returns SQLITE_MISUSE error

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File-Level Changes

Change	Details	Files
Enhanced cache management in defined functions	Added a boolean flag to track whether the cache has been freed. Guarded cache-related operations in cache_print, define_exec, and define_function to prevent usage after cache is freed. Updated cache_free function to set the new flag after clearing the cache.	src/define/manage.c
Refactored README documentation	Renamed the 'Funding' section to 'Support'. Updated copyright information to extend the copyright year.	README.md
Fixed handling of empty fields in the extension reader	Added a check in vsv_read_one_field to initialize an empty string when the content row starts with empty fields, addressing issue VSV: first row handled incorrectly if contains an empty string nalgeon/sqlean#139.	src/vsv/extension.c

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