RFR: 8358772: Template-Framework Library: Primitive Types

[Emanuel Peter]

I would like to add primitive type support to the template framework library.

In follow-up work, we will use these types in random expression generation - but they can also already be useful on their own now.

I encountered an issue with some methods that return `Token` from the `TemplateFramework`, such as `Hook.insert` and `addDataName`. Since `Token` was package private, this class could not be used in some places where automatic type inference is required. I now refactored the code, so that the `Token` is just an empty interface, and all the methods are moved to a separate class `TokenParser`.

Original experiments from here: https://github.com/openjdk/jdk/pull/23418

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Commit messages:
 - parser refactor
 - rm previous changes
 - rm unnecessary file
 - documentation
 - improve test
 - wip test
 - size and boxing
 - update tests
 - add test, does not compile now
 - types
 - ... and 1 more: https://git.openjdk.org/jdk/compare/248341d3...08b9f674

Changes: https://git.openjdk.org/jdk/pull/25672/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25672&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8358772
  Stats: 633 lines in 7 files changed: 593 ins; 35 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25672.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25672/head:pull/25672

PR: https://git.openjdk.org/jdk/pull/25672