feat(bitbucket-server): convert to typescript (#3756)

.eslintrc.js

lib/platform/bitbucket-server/bb-got-wrapper.ts

lib/platform/bitbucket-server/index.ts

lib/platform/bitbucket-server/utils.ts

lib/platform/common.ts

lib/platform/git/storage.ts

lib/types.d.ts

lib/util/host-rules.ts

package.json

...latform/bitbucket-server/__snapshots__/index.spec.ts.snap

test/platform/bitbucket-server/index.spec.ts

test/platform/index.spec.js

yarn.lock