Sorry for the rather large size of PR. 😓 But essentially, not changed so
much.
#### 1. Reorganize directories and namings
```
src/jsdoc
├── builder.rs 👈🏻 for SemanticBuilder
├── finder.rs 👈🏻 `semantic.jsdoc()`
├── mod.rs
└── parser
├── jsdoc.rs 👈🏻 `JSDoc` struct which has `comment` and `tags`
├── jsdoc_tag.rs 👈🏻 `JSDocTag` struct
├── mod.rs
├── parse.rs 👈🏻 parsing logic by `JSDocParser`
└── utils.rs
```
Now `mod.rs` has only export things.
#### 2. Introduce `JSDocTagKind::Unknown(name)`
We need to keep their name as-is to check valid tag names are used.(e.g.
`jsdoc/check-tag-names` rule)
#### 3. Support multiline description
- Comment for JSDoc
- Comment for each JSDocTag
```js
/**
* @foo this comment continues
* here but leading * should be ignored!!
*/
```
- - -
Please correct me if I am doing something wrong... 🐰
