WIP: feat($compile): display line numbers for errors in the parser (#6338)

[Kingwl]

#6338

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch for v2.x (or to a previous version branch), not the master branch
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[gebilaoxiong]

can I use /\r\n?|\n|\u2028|\u2029/ ....? 😃

[yyx990803]

This is great! A few things to improve:

• Make this dev mode only to save bytes
• Extend this feature to all warnings during template compilation, including parser and codegen

[yyx990803]

Thanks for the great work on starting this - closing in favor of #7127