Ensure all spans have document offsets

[kazcw]

Pull Request Description

• Validate spans during existing lexer and parser unit tests, and in enso_parser_debug.
• Fix lost span info causing failures of updated tests.

Important Notes

• Output of parse_all_enso_files.sh is unchanged since before Parser TS bindings #7881 (modulo libs changes since then).
• When the parser encounters an input with the first line indented, it now creates a sub-block for lines at than indent level, and emits a syntax error (every indented block must have a parent).
• When the parser encounters a number with a base but no digits (e.g. 0x), it now emits a Number with None in the digits field rather than a 0-length digits token.

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.

[Frizi]

I think that space was intentional.

[kazcw]

It was, but I've changed handling of this case. It is now a syntax error to start a file with an indented line. This is now covered by the parser unit tests.

[jdunkerley]

Approving the libs change.