Omit #class for simple values

[amomchilov]

Fixes ruby/vscode-rdbg#37

This PR depends on the changes in #1001. Only this last commit of this PR is unique to this change.

Description

The class of many values is self-evident and just clutters the UI:

Before	After

(false and nil don't have it, because of this bug described here)

This PR omits the usual #class member for instances of these classes:

• NilClass
• FalseClass
• TrueClass
• Symbol
• String
• Integer
• Float
• Class
• Module
• Array
• Hash

The result is a much tidier UI you see in the "After" screenshot above.

This change still keeps the #class for other types, including subclasses of these simple types. For example, HashWithIndifferentAccess is a subclass of Hash. For clarity, we preserve its #class, but omit it for regular hashes.

[ko1]

Class and Module is not clear with the names so I want to leave them.

[launchable-app]

❌ Tests Failed

✖️11 tests failed ✔️658 tests passed(1 flake)

7/23 test sessions failed

❌ Test session #3437636 failed   details on CI
_{🔔 no issues ✖️11 tests failed ✔️53 tests passed}

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❌ Test session #3437630 failed   details on CI
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❌ Test session #3437621 failed   details on CI
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❌ Test session #3437619 failed   details on CI
_{🔔 no issues ✖️11 tests failed ✔️53 tests passed}