Feature: Import System

[ansurfen]

Implement a flexible and conflict-resilient import system with support for multiple styles, name aliasing, and name conflict detection.

// math.hl
pub fn add(a: num, b: num) => $a + $b

pub fn mul(a: num, b: num) => $a * $b

// utils.hl
import "math" as m
import * from "math" // ❌ Error: name conflict
import { mul } from "math"

pub fn add(a: num, b: num) => m.add($a, $b)
pub fn mul               // ❌ Error: name conflict with imported `mul`

// Invalid syntax examples
import { mul as m } from "math"      // ❌ Error
import * as m from "math"           // ❌ Error

// Valid workaround
import { mul as ml } from "math"
pub fn mul(a: num, b: num) => ml($a, $b)

// main.hl
import "math"
import * from "utils"
import "math" as m
import { add as a } from "math"

echo add(1, 2) // utils's
echo math.add(1, 2) m.mul(1, 2) a(1, 2)

Export Table:

math.add math.mul
add (utils.add) mul (utils.mul)
m.add m.mul
a -> math.add