cli: adds compile command and -cachedir option (#945)

This adds a `compile` command and a `-cachedir` option to expose our
compilation cache to end users. This allows substantial speedup
especially for large wasm.

Signed-off-by: Adrian Cole <adrian@tetrate.io>
Co-authored-by: Anuraag Agrawal <anuraaga@gmail.com>

internal/wasmdebug/dwarf_test.go

@@ -3,7 +3,6 @@ package wasmdebug_test
 import (
 	"fmt"
 	"math"
-	"strings"
 	"sync"
 	"testing"
 
@@ -247,8 +246,6 @@ func TestDWARFLines_Line_Rust(t *testing.T) {
 		t.Run(fmt.Sprintf("%#x/%s", tc.offset, tc.exp), func(t *testing.T) {
 			actual := mod.DWARFLines.Line(tc.offset)
 
-			fmt.Println(strings.Join(actual, "\n"))
-
 			require.Equal(t, len(tc.exp), len(actual))
 			for i := range tc.exp {
 				require.Contains(t, actual[i], tc.exp[i])