Enforce kebab IDs in spin new and spin add

[itowlson]

Fixes #3662

# spin new
$ spin new http-rust badname-123         # Bad name on CLI
Name must be kebab-cased, and each segment must begin with a letter.
Enter a name for your new application: bad-name-123       # Bad name entered interactively
Name must be kebab-cased, and each segment must start with a letter. Try another application name (or Crl+C to exit): bad-name-bbb123        # Good name still accepted
Description []:

# spin add
$ spin add http-rust worse-name-123
Name must be kebab-cased, and each segment must begin with a letter.
Enter a name for your new component: worse-name-1234
Name must be kebab-cased, and each segment must start with a letter. Try another component name (or Crl+C to exit):
# etc