Refactor Compiler Plugin Code and Invalidate Path Parameters

[ThisaruGuruge]

Purpose

• Refactoring the compiler plugin code to match with the compile-time schema generation task.
• Disallow the path parameters and resource functions without resource path (dotted resources).

Fixes: #2465

Examples

The following resource functions inside a GraphQL service will cause compilation errors.

Example 1 - Path Parameters:

resource function get profile/[string id]/name() returns string {
    return "Walter White";
}

Example 2 - Path rest parameters:

resource function get profile/[string ...ids] returns string {
    return "Walter White";
}

Example 3 - Dotted resource paths:

resource function get .() returns int {
    return 767;
}

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #510 (e23025e) into master (9b21ede) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #510   +/-   ##
=========================================
  Coverage     94.59%   94.59%           
  Complexity      335      335           
=========================================
  Files            53       53           
  Lines          3368     3368           
  Branches       1748     1748           
=========================================
  Hits           3186     3186           
  Misses          153      153           
  Partials         29       29           

Impacted Files	Coverage Δ
ballerina/response_formatter.bal	97.93% <0.00%> (-1.03%)	⬇️
ballerina/engine.bal	98.43% <0.00%> (+1.51%)	⬆️

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