Wrap the arguments passed to the scalac task between "

[hamzaremmal]

When running scalac in the sbt shell, the following task will invoke the compiler's main method and forward the arguments as a single string.

If we do the following:

sbt:scala3> scalac "test.scala" "-Wconf:msg=Given search preference:silent"

The compiiler will not correctly parse the provided arguments, resulting in the following behaviour:

[info] running (fork) dotty.tools.dotc.Main -d <redacted>/scala3/compiler/../out/default-last-scalac-out.jar -classpath <redacted>/v1/https/repo1.maven.org/maven2/org/scala-lang/scala-library/2.13.14/scala-library-2.13.14.jar:<redacted>/scala3/library/../out/bootstrap/scala3-library-bootstrapped/scala-3.6.0-RC1-bin-SNAPSHOT-nonbootstrapped/scala3-library_3-3.6.0-RC1-bin-SNAPSHOT.jar test.scala -Wconf:msg=Given search preference:silent
source file not found: test.scala
source file not found: search
source file not found: preference:silent

This PR fixes the following discribed issue by wrapping each argument between " before calling the compiler's main method.

[bracevac]

lgtm, thanks!