add any -> record to metadata

[amtoine]

Description

in the help page of metadata, there is the following example

ls | metadata

which gives the following error

Error: nu::parser::input_type_mismatch

  × Command does not support table input.
   ╭─[entry #2:1:1]
 1 │ ls | metadata
   ·      ────┬───
   ·          ╰── command doesn't support table input
   ╰────

this PR adds any -> record to the signatures of metadata to allow the use of that kind of example.

User-Facing Changes

ls | metadata will work again

Tests + Formatting

• 🟢 toolkit fmt
• 🟢 toolkit clippy
• ⚫ toolkit test
• ⚫ toolkit test stdlib

After Submitting

[sophiajt]

You don't need Type::Nothing if you have Type::Any

[amtoine]

ooh that's a good point 👌

[amtoine]

should be fixed in 3693423