[Feature]: `corefunc_int_base_encode`

### What functionality would you like to see?

```hcl
corefunc_uint_base_encode "base36" {
  uint = 42
  base = 36
}
#=> 16

corefunc_uint_base_encode "base16" {
  uint = 42
  base = 16
}
#=> 2a

corefunc_uint_base_encode "base2" {
  uint = 42
  base = 2
}
#=> 101010
```

* https://github.com/hashicorp/terraform/pull/32130
* https://pkg.go.dev/strconv#FormatUint
