Lint package configuration

[huozhi]

Lint the package exports or main field configuration in package.json based on the package module type. Replace previous publint integration

For example you have a bad configuration package.json:

In this package, it's CJS by deafult, and have following issues:

• require cannot reference to a ESM output
• import cannot reference to a CJS output

{
  "exports": {
    ".": {
      "require": "./dist/index.mjs"
    },
    "./foo": {
      "import": "./dist/foo.js"
    }
  } 
}

bunchee will still build but warn you with message

⚠️ Cannot export `require` field with .js or .mjs extension in ESM package, only .cjs extensions are allowed
⚠️   ./dist/index.js
⚠️ Cannot export `import` field with .cjs extension in ESM package, only .js and .mjs extensions are allowed
⚠️   ./dist/foo.cjs
Exports  File           Size
 .     dist/index.js  42 B
 ./foo dist/foo.cjs   103 B

Closes #377
Closes #393