DEV2-3340 include text in workspace context

[yonip23]

1. fetch at most 2 symbols per "findSymbols" command
2. instead of only "name - file path", add the entire symbol code, like the retrieval does
3. cache the BasicContext to later be used by the "get_enriching_context" handler
4. try to obtain the language field from the binary's metadata response, and use the IDE one as fallback (for both basic and enriching context handlers)

Example resulting symbols text:

file: kaki/kaki/Student2.java
<3 backticks>ECMAScript 6
public class Student2 {
    public void run() {
        System.out.println(\"Welcome to Student 2\");
    }
}
<3 backticks>
file: kaki/kaki/Student.java
<3 backticks>ECMAScript 6
public class Student {
    public void rerunIt() {}
    public void run() {
        Scanner scanner = new Scanner(System.in);
        System.out.println(\"Enter your name: \");
        String name = scanner.nextLine();
        System.out.println(\"Enter your age: \");
        int age = scanner.nextInt();
        System.out.println(\"Your name is \" + name + \" and your age is \" + age);
    }
}
<3 backticks>

(the IDE resolves the language very poorly, I know, that's why (4) is done)

[yonip23]

same logic - used ?.let instead of if/else