feat: customizable ttl

[fernandezcuesta]

Description of your changes

Add the ability to set a custom TTL for the function response.

It allows 3 ways to set it up besides the default, from lower to higher precedence:

• default (current behaviour)
• as a cli argument (deploymentruntimeconfig)
• as a function input
• as an annotation in the XR

Fixes #424

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit tests for my change.

[chlunde]

go1.24.3 was a security release so if updating to 1.24, it should be 1.24.3 (or .4 in a couple of days)