Improve response of get latest distribution resource

[anupama-pathirage]

@keizer619 cloned issue wso2-enterprise/ballerina-registry#2104 on 2023-06-20:

Description:

Currently get latest distribution returns a json where all 3 attributes have same version

• request url

https://api.central.ballerina.io/2.0/update-tool/distributions/latest?version=2201.0.0

• response

{"major":"2201.6.0", "minor":"2201.6.0", "patch":"2201.6.0"}

Ideally it should return given versions latest patch, minor and major as below

1.x releases

• request url

  https://api.central.ballerina.io/2.0/update-tool/distributions/latest?version=1.1.0

• response

  
  {"major":"2201.6.0", "minor":"1.2.39", "patch":"1.1.4"}
  

2201.x releases

• request url

https://api.central.ballerina.io/2.0/update-tool/distributions/latest?version=2201.0.0

• response

{"major":"2201.6.0", "minor":"2201.6.0", "patch":"2201.0.5"}