feat: added inlay hints

[cadamsdev]

Adds support for inlay hints
https://code.visualstudio.com/docs/typescript/typescript-editing#_inlay-hints

Preview

Support

RHS / Declaration	Example	Inferred Type	Shows Hint?
Integer literal	x := 42	int	✅
Negative integer	x := -7	int	✅
Hex literal	x := 0xff	int	✅
Octal literal	x := 0o77	int	✅
Binary literal	x := 0b1010	int	✅
Float literal	x := 3.14	f64	✅
Single-quote string	x := 'hello'	string	✅
Double-quote string	x := "hello"	string	✅
Boolean	x := true	bool	✅
mut variable	mut x := 42	int	✅
Single-line const	const pi = 3.14	f64	✅
const block	const (\n max = 100\n)	int	✅
Same-file fn call	msg := get_greeting()	string	✅
Local project fn call	msg := helper_fn()	string	✅
Stdlib fn call	dir := os.temp_dir()	string	✅
Result fn call	data := read() or { return }	string	✅ (strips !)
Cast expression	x := u16(12)	—	❌ needs compiler
Struct init	x := MyStruct{}	—	❌ needs compiler
Array init	x := []int{}	—	❌ needs compiler
Method call	x := obj.method()	—	❌ needs type inference
Multi-assignment	a, b := split()	—	❌ not supported

[JalonSolov]

A conflict, now that #486 was merged.

[cadamsdev]

A conflict, now that #486 was merged.

Fixed 🙂

[dy-tea]

Thanks for your contribution!