Measurement of CP asymmetries and polarisation fractions in B s 0 $\rightarrow$ K $\ast$ 0~K \textasciimacron $\ast$ 0 \textdollar\textdollar $\lbrace$B$\rbrace$\_s\^0\textbackslashto $\lbrace$K$\rbrace$\^$\lbrace$\textbackslashast 0$\rbrace$$\lbrace$\textbackslashoverline$\lbrace$K$\rbrace$$\rbrace$\^$\lbrace$\textbackslashast 0$\rbrace$ \textdollar\textdollar decays