Implement most missing wasm-c-api APIs (#303) (#676)

Remove unnecessary functions and implement more APIs:
- wasm_##name##same
- wasm##name##as_ref
- wasm_ref_as##name##
- wasm_ref_delete
- wasm_module_validate
- wasm_table_get/set/size
- wasm_memory_size
- wasm_config_new
- wasm_foreign_new

And add more wasm-c-api samples, update the related documen, add more CI rules.

Signed-off-by: Wenyong Huang <wenyong.huang@intel.com>

core/iwasm/interpreter/wasm_runtime.h

@@ -456,4 +456,3 @@ wasm_interp_dump_call_stack(struct WASMExecEnv *exec_env);
 #endif
 
 #endif /* end of _WASM_RUNTIME_H */
-