Caching utility macros: defcacheable, defevict and defupdatable

[cabol]

Implement utility macos:

defcacheable

Defines a cacheable function with the given name fun and arguments args. The returned value by the code block is cached if it doesn't exist already in cache, otherwise, it is returned directly from cache and the code block is not executed.

defcacheable cacheable_fun(x, y \\ "y"), cache: Cache, key: x do
  # logic ...
end

defevict

Defines a function with cache eviction enabled on function completion (one or all values are removed on function completion).

defevict evict_fun(x), cache: Cache, key: x do
  # logic ...
end

defupdatable

Defines an updatable caching function. The content of the cache is updated without interfering the function execution. That is, the method would always be executed and the result cached.

defupdatable updatable_fun(x), cache: Cache, key: x do
  # logic ...
end