currycli: implement python cmd style interfaces

Signed-off-by: Rohit Yadav <bhaisaab@scale.ninja>
currycli_test: modify test to test NewCurry method

Signed-off-by: Rohit Yadav <bhaisaab@scale.ninja>
currcli: add more methods

Signed-off-by: Rohit Yadav <bhaisaab@scale.ninja>