templates: add head and tail functions

Add head and tail functions to get beginning or ends of strings.

E.g.:

{{"hello" | head 2}} will return "he"
{{"hello" | tail 2}} will return "lo"

Implements: https://todo.sr.ht/~rjarry/aerc/220
Changelog-added: New `head` and `tail` templates functions for strings.
Signed-off-by: Bence Ferdinandy <bence@ferdinandy.com>
Reviewed-by: Moritz Poldrack <moritz@poldrack.dev>
Acked-by: Robin Jarry <robin@jarry.cc>

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