Fix tool id handling for shed-installed tools

[guerler]

1. Fix tool name construction for shed installed tools
2. Coerce optional numeric params (integer/float/data_column) to None
3. Add guard to encode id for optional data inputs

How to test the changes?

(Select all options that apply)

• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

• I agree to license these and all my past contributions to the core galaxy codebase under the MIT license.