missing compile-time evaluation for `convert`, `slice` and `extract32`

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Description

Contributor guide

Research direction

Add `def evaluate()` implementations to the classes for `convert`, `slice`, and `extract32` in `vyper/builtin functions/functions.py` to enable compile time evaluation.

Tech stack

python

Domain

blockchain

Issue type

Feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

Half day

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

Python

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

70