fix(iota-move): fix os error 2 for iota move new command using <NAME> with uppercase letter(s)

[roman1e2f5p8s]

Description of change

• Use the provided <NAME> instead of its lowercase variant to obtain the correct and existing path for writing.
• Update <NAME> validation error message: since <NAME> is validated as an Identifier, a valid <NAME> can also start with an uppercase letter or underscore.

Links to any relevant issues

Fixes #4895.

Type of change

• Bug fix (a non-breaking change which fixes an issue)

How the change has been tested

Run the following before and after the change:

cargo build
./target/debug/iota move new Xxx

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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