Allow injecting values into tasks about pie

[MeAmAnUsername]

func <name>(<params>)[<context_params>] -> <res_type> = <exp>

func parseIR(input: supplier<string>)[irParse: IRParse] -> IStrategoTerm = ...
func invokeStrategoStrategy(...)[runtime: StrategoRuntime, @Named projectName: String] -> IStrategoTerm = ...

Description

• Parts of the context that the task needs access to.
  • Just compiles to Dagger Dependency injection for now
  • Different compiler could compile it to e.g. other injection framework, access of static variable, lookup in a store, etc.
• optional; if no context parameters the [] can be omitted
  • backwards compatible with existing syntax

requirements:

Required:

• has to work both with foreign java and in-DSL functions => should be part of signature
• not ambiguous with existing or future syntax

Nice to have:

• easy to distinguish regular and context parameters => not an annotation in regular parameters

Syntax

Same as parameters but with [ ] instead of ( )

Examples / Goals

When this construct is implemented, the following should compile

func compileIrToDist(ast: supplier<IStrategoTerm>)[runtime: StrategoRuntime] -> IStrategoTerm =
  runtime.invokeNoNull("compileToDist", ast.get<>());

func compileIrToPlsql(ast: supplier<IStrategoTerm>)[runtime: StrategoRuntime] -> IStrategoTerm =
  runtime.invokeNoNull("compileToPlsql", ast.get<>());

func parseCpp(input: supplier<string>) -> ParseResult =
  foreign oracle.cpp.spoofax.task.cppParse

class compileIrToDist implements TaskDef<Supplier<IStrategoTerm>, IStrategoTerm> {
  private final StrategoRuntime runtime;
  
  @Inject public compileIrToDist(StrategoRuntime runtime) {
    this.runtime = runtime;
  }

  public String id() {...}

  public IStrategoTerm exec(ExecContext execContext, Supplier<StrategoTerm> ast) {
    return runtime.invokeNoNull("compileToDist", ast.get());
  }
}

class compileIrToPlsql implements TaskDef<Supplier<IStrategoTerm>, IStrategoTerm> {
  private final StrategoRuntime runtime;
  
  @Inject public compileIrToPlsql(StrategoRuntime runtime) {
    this.runtime = runtime;
  }

  public String id() {...}

  public IStrategoTerm exec(ExecContext execContext, Supplier<StrategoTerm> ast) {
    return runtime.invokeNoNull("compileToPlsql", ast.get());
  }
}