Input parameter validation

[ThisaruGuruge]

Purpose

Fixing bugs in input parameter validation.

Fixes: #1251
Fixes: #1269
Fixes: #1266

Examples

N/A

Checklist

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

[codecov]

Codecov Report

Merging #192 (2a5243b) into master (6b3bc35) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #192      +/-   ##
============================================
+ Coverage     89.13%   89.32%   +0.19%     
- Complexity      194      197       +3     
============================================
  Files            41       41              
  Lines          1703     1696       -7     
  Branches        686      693       +7     
============================================
- Hits           1518     1515       -3     
+ Misses          166      164       -2     
+ Partials         19       17       -2     

Impacted Files	Coverage Δ	Complexity Δ
graphql-ballerina/engine.bal	76.00% <ø> (-5.54%)	0.00 <0.00> (ø)
graphql-ballerina/records.bal	71.42% <ø> (ø)	0.00 <0.00> (ø)
graphql-ballerina/executor_visitor.bal	92.53% <100.00%> (ø)	0.00 <0.00> (ø)
graphql-ballerina/validator_visitor.bal	90.70% <100.00%> (+0.25%)	0.00 <0.00> (ø)
...allerina/stdlib/graphql/runtime/engine/Engine.java	90.74% <100.00%> (+0.54%)	13.00 <0.00> (+1.00)
...ina/stdlib/graphql/runtime/schema/FieldFinder.java	96.11% <100.00%> (+1.94%)	32.00 <0.00> (+1.00)
.../graphql/runtime/schema/SchemaRecordGenerator.java	100.00% <100.00%> (+2.66%)	26.00 <0.00> (+1.00)

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