Fix: `node:test` not grouped with `<BUILTIN_MODULES>`

Following discussion in #142 , this adds an explicit check for "node:test" to BUILTIN_MODULES_REGEX_STR in order to properly group it with other builtin modules.

Test covers:

"node:test" correctly gets grouped in with other builtin node modules
"node:test" is correctly sorted among other builtin node modules
"*node:test" is NOT grouped in with builtin modules
"node:test*" is NOT grouped in with builtin modules
"node" is NOT grouped in with builtin modules
"test" is NOT grouped in with builtin modules

Fixes https://github.com/IanVS/prettier-plugin-sort-imports/issues/142

IanVS / prettier-plugin-sort-imports

Fix: `node:test` not grouped with `<BUILTIN_MODULES>` #143