Improve the data type checking for 2-D arrays passed to the GMT C API

[seisman]

Some factors you should know:

1. The _check_dtype_and_dim function is used in put_vectors and put_matrix only
2. GMT_Put_Matrix (i.e., put_matrix) can only accept 2-D arrays with numeric dtypes (e.g., GMT_INT)
3. GMT_Put_Vectors (i.e., put_vectors) can accept 1-D arrays in both numeric dtypes (e.g., GMT_INT) and text dtypes (e.g., GMT_TEXT/GMT_DATETIME)

Previously, we check if the array dtype exists in the DTYPES dict for both 1-D and 2-D arrays. This PR splits DTYPES into DTYPES_NUMERIC and DTYPES_TEXT, and explicitly check if 2-D array dtype in DTYPES_NUMERIC.