refactor(web): cookie serialization + deserialization 🧩

chore(web): renames folder for namespaced Web code 🧩

refactor(web): common config for both types of Keyman Engine for Web 🧩

change(web): keyboard caching, fetching modularization 🧩

feat(common/web): keyboard-loading modules 🧩

chore(web): Merge branch 'change/web/keyboard-cache-fetch-modularization' into refactor/web/common-configuration

chore(web): Merge branch 'change/web/keyboard-cache-fetch-modularization' into refactor/web/common-configuration