refact: change cascading type for Album and ARtist entity

feat: add put and delete request

test:service: add test for post method

feat: Add exception handler for duplicate entry and item not found

feat:created AlbumDTO

feat:service: implement insertAlbum()

test:service:test insertAlbum()

test:service:test getAlbumById()

test:service:test getAllAlbums()

feat:service:implemetn getAllAlbums()

feat:controller:add endpoint getAlbumById()

test:controller:test endpoint getAlbumById()

feat:controller:add endpoint getAllAlbums()

test:Controller: getAllAlbums()

feat:create model,controller,service and repository packages and relevant classes