feat(emacs): Add asynchronous weather fetching to wttrin

Introduce asynchronous data fetching to the wttrin.el Emacs package.
This enhancement avoids blocking Emacs during data retrieval by
using `url-retrieve` for async calls. The behavior is controlled via
a new customizable variable `wttrin-use-async`. Tests have been
added for the new async behavior to ensure proper functionality.feat:makefile): Add package initialization for Emacs batch

Enhance Makefile with package support by loading and initializing
MELPA archive before validating and compiling, ensuring required
packages are available during these operations.

feat(tests): Add unit tests for `wttrin--display-weather`

Introduce comprehensive tests for `wttrin--display-weather` function
to validate buffer creation, content, keybindings, and error
handling.

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