Adding an option to redefine amsmath environments

[Basmah1961]

I think it is a good to add an optional argument for \UseTblrLibrary{amsmath} as \UseTblrLibrary[export]{amsmath} to allow the use of tabularray keys directly in the conventional amsmath environments. For example, array should be redefined to become +array

\documentclass{article}

\usepackage{fancyhdr}
\pagestyle{empty}

\usepackage{xcolor}

\usepackage[fleqn]{amsmath}

\usepackage{tabularray}
\UseTblrLibrary{amsmath}

\begin{document}

\begin{equation*}
f(x)=
\begin{cases}%[column{2}={r}, row{2}={purple8}] cases should become +cases 
	0
	& \text{The}
	\\
	\dfrac{1}{3}
	& \text{quick}
	\\
	\dfrac{2}{3},
	& \text{brown}
	\\
	1
	& \text{fox}
	\\
\end{cases}
\end{equation*}

\begin{equation*}
f(x)=
\begin{+cases}[column{2}={r}, row{2}={purple8}]
	0
	& \text{The}
	\\
	\dfrac{1}{3}
	& \text{quick}
	\\
	\dfrac{2}{3}
	& \text{brown}
	\\
	1
	& \text{fox}
	\\
\end{+cases}
\end{equation*}

\end{document}