[Improvement]: Implement the getLocation API for the structured type symbols

[nipunayf]

Description

Currently, the getLocation invocation for the structured type symbols described in the spec returns an empty value. As these types are defined by the user, it's optimal to override the following method for the respective type symbols.

ballerina-lang/compiler/ballerina-lang/src/main/java/io/ballerina/compiler/api/impl/symbols/AbstractTypeSymbol.java

Lines 86 to 88 in 147e4a2

	public Optional<Location> getLocation() {
	return Optional.empty();
	}

Describe your problem(s)

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Describe your solution(s)

If the getLocation implementation is the same across all the respective typeSymbols, we can write an abstract class called StructuredTypeSymbol as the parent class. Otherwise, we may have to override the given values individually.

Related area

-> Compilation

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