Fix devfile component preferences deserialization through GSON

[mkuznyetsov]

What does this PR do?

Add TypeAdapterFactory for GSON in DtoFactory, that would support Serializable type, that we have in Devfile Preferences

Special Note regarding parsing of numbers:
It is known problem that by default all numeric types are parsed as double in Gson library, resulting in conversion of integer numbers like 1 into decimal point form 1.0 and rounding dome double type values. [1], [2]. This is a not a problem for JSON itself, since it is doesn't have strict typing, and as a numeric, those two values are identical. But to preserve user input maximally, we're added code that tries to parse value as an Long first, and than if wasn't succesfull, fallback to the Double form. This preserves the integer values, but may result that decimal zeroes may be trimmed, e.g. 1.00 will be converted into 1, which is for sure much more rare form of defining integer numbers.

[1] google/gson#1084
[2] https://stackoverflow.com/questions/24926786/make-gson-deserialize-numbers-to-integers-or-doubles

What issues does this PR fix or reference?

#14289

Release Notes

Docs PR

[che-bot]

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[che-bot]

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[tolusha]

/cc @tolusha

[skabashnyuk]

In general looks ok to me. @mshaposhnik @metlos @sleshchenko wdyt?

[mshaposhnik]

Ok if it fixes the problem

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

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[mkuznyetsov]

@sleshchenko @mshaposhnik @skabashnyuk @metlos
so there was a problem with this approach, using default ObjectAdapter all numbers would deserialize to long, even if they could be just integer. Unlike Jackson deserializer, which guesses the correct types in this case.

(there are numbers of issues in GSON repo for this, like this one google/gson#1084)

I'm not sure whether it's critical in our case, but I thought it might be important to have our parsers to behave the same way, so I added a custom type adapter with the last commit to fix this problem in the simplest option.

So the question is, do we need to bother with this at all, and if are there any better alternatives to it

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has been successful:

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[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• "che-server" docker image: maxura/che-server:14306
• test artifacts
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

• build details
• "che-server" docker image: maxura/che-server:14306

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:14306
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• "che-server" docker image: maxura/che-server:14306
• test artifacts
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

• build details
• "che-server" docker image: maxura/che-server:14306

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has been successful:

• Build details
• Test report
• docker image: eclipseche/che-server:14306

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has failed:

• build details
• "che-server" docker image: maxura/che-server:14306
• test artifacts
• https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "crw-ci-test" to rerun the test.

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:14306
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[metlos]

the latest master needs to be merged into this PR for the happy paths to succeed.

[che-bot]

E2E Happy path tests of Eclipse Che Single User on K8S (minikube v1.1.1) has been successful:

• build details
• "che-server" docker image: maxura/che-server:14306

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has been successful:

• Build details
• Test report
• docker image: eclipseche/che-server:14306

[mshaposhnik]

ci-build