leverage Fig's shell parser, add git spec (#240001)

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>
Co-authored-by: Daniel Imms <2193314+Tyriar@users.noreply.github.com>

extensions/terminal-suggest/fixtures/shell-parser/primaryExpressions/input.sh

@@ -0,0 +1,35 @@
+### Case 1
+a "\${b}"
+
+### Case 2
+a "'b'"
+
+### Case 3
+a "\${b:+"c"}"
+
+### Case 4
+a b"c"
+
+### Case 5
+a '\${b}'
+
+### Case 6
+a $'\${b}'
+
+### Case 7
+a $'b''c'd$$$e\${f}"g"
+
+### Case 8
+a $'b\\'c'
+
+### Case 9
+a 'b\\'c'
+
+### Case 10
+a "b$"
+
+### Case 11
+a "$b"
+
+### Case 12
+a "$(b "c" && d)"