RFR: 8255489: Unify the parsing of @lambda-proxy and @lambda-form-invokers tags in a classlist [v3]

[Calvin Cheung]

> With this change, the parsing of the `@lambda-proxy` and the `@lambda-form-invokers` tags in a classlist will be performed in the same function - `ClassListParser::parse_at_tags()`.
> 
> Also removing the `:` of the `@lambda-proxy:` to be consistent with the `@lambda-form-invokers `tag.
> 
> Ran tiers 1 through 4 tests successfully.

Calvin Cheung has updated the pull request incrementally with one additional commit since the last revision:

  add invalid @ tag tests

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/942/files
  - new: https://git.openjdk.java.net/jdk/pull/942/files/a3b75186..63f1201a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=942&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=942&range=01-02

  Stats: 14 lines in 2 files changed: 14 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/942.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/942/head:pull/942

PR: https://git.openjdk.java.net/jdk/pull/942