Added tags for props to serialization (including ParserOption to enable)

[carmnk]

@pvasek sorry for the delay.
I've updated the PR to 1.21.0, added the union test for the PR and added test functionality to check prop tags in testUtils.ts.
I've also made an additional change in src/parser.ts:

Only if the added ParserOption shouldIncludePropTagMap is true, instead of jsDocComment.fullComment (default), jsDocComment.description is used as prop description. This will return the plain property description without any tags while tags are served separately. Default behavior (shouldIncludePropTagMap is false or undefined) is unchanged.

I think that would also be an option for default behavior (if so the additional ParserOption would be obsolete). Currently property tags are included in the description as string:
`
/** prop2 description

• @internal some internal prop
• @kind category 1
  */
  prop2: string;

==> output default/currently:
result[0].props.prop2.description => "prop2 description\n@internal some internal prop\n@kind category 1"

==> output (shouldIncludePropTagMap===true ):
result[0].props.prop2.description => "prop2 description"
result[0].props.prop2.tags => {internal: "some internal prop", .... }
`

I hope the PR is acceptable now, otherwise please let me know.

[pvasek]

@carmnk thanks a lot! Published on npm as v1.22.0.