Update validateDocument function to validate the entire document and return all validation errors at once

[MohamedSabthar]

Purpose

Fixes: #2848

Examples

Checklist

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

[codecov]

Codecov Report

Base: 88.71% // Head: 88.46% // Decreases project coverage by -0.24% ⚠️

Coverage data is based on head (34d7152) compared to base (5eb48ba).
Patch coverage: 60.97% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #950      +/-   ##
==========================================
- Coverage   88.71%   88.46%   -0.25%     
==========================================
  Files          57       57              
  Lines        4377     4414      +37     
  Branches     2514     2527      +13     
==========================================
+ Hits         3883     3905      +22     
- Misses        464      479      +15     
  Partials       30       30              

Impacted Files	Coverage Δ
ballerina/modules/parser/argument_node.bal	58.69% <20.00%> (-4.72%)	⬇️
ballerina/modules/parser/fragment_node.bal	57.77% <20.00%> (-10.80%)	⬇️
ballerina/modules/parser/operation_node.bal	70.00% <20.00%> (-7.15%)	⬇️
ballerina/engine.bal	96.91% <100.00%> (+0.59%)	⬆️
ballerina/field_validator_visitor.bal	96.84% <100.00%> (+0.05%)	⬆️
ballerina/fragment_cycle_finder_visitor.bal	88.88% <100.00%> (+0.31%)	⬆️
ballerina/fragment_validator_visitor.bal	94.00% <100.00%> (+0.38%)	⬆️
ballerina/variable_validator_visitor.bal	97.82% <100.00%> (+0.06%)	⬆️

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