Move big input component into Input.js, port some of the manager app to TS (#1431)

packages/desktop-client/src/components/ServerContext.tsx

packages/desktop-client/src/components/common/Input.tsx

...es/desktop-client/src/components/manager/ConfigServer.tsx

packages/desktop-client/src/components/manager/ServerURL.tsx

.../src/components/manager/subscribe/ConfirmPasswordForm.tsx

...desktop-client/src/components/manager/subscribe/Login.tsx

...esktop-client/src/components/manager/subscribe/common.tsx

packages/loot-core/src/types/server-handlers.d.ts

upcoming-release-notes/1431.md