feat(handler): add param of maxdistance drone

feat(drone-service): support max distance

fix(main): fix default env

test(handler): update unit-test

refactor(repository): remove unused file

test(handler): add endpoint test

test(api_test): remove hello endpoint test

build(package): remove go-cmp

build(makefile): update makefile to generate the mock from service/interface

feat(service): refactor interface to different file and generate the interfaces.mock

build(package): add testify package

feat(handler): add internal server error response

test(tree-service): add unit-test

test(test-service): update unit-test

test(estate-service): add unit-test