Better error messages

[semihsalihoglu-uw]

• Non-existing function in CALL: I am not sure if this applies to non-existing function calls in other expressions but in CALL the following happens:

kuzu> CALL show_table("small_r") RETURN *;
Error: unordered_map::at: key not found

Let's say something like: "show_table is not a valid function name".

• Non-existing node table:

MATCH (a:kz_ex_rt) RETURN *;
Error: Assertion failed in file "/Users/ssalihog/projects/vs-code-projects/kuzu/kuzu-master/src/binder/bind/bind_graph_pattern.cpp" on line 606: KU_UNREACHABLE

Let's say something like: "kz_ex_rt is not a valid node table name".

[andyfengHKU]

Fixed in #2749