Fix regexp patterns for block parameters

[taichi-ishitani]

Motivation

close #3184
close #3211

VS Code plugin does not highlight the cases below.

• Rest keyword block parameter
• Block parameter separator | with two or more spaces before it

Implementation

For first issue, I changed the pattern to check variable type.

Before:

ruby-lsp/vscode/grammars/ruby.cson.json

Line 2263 in 841e92c

"match": "\\G([&*]?)([a-zA-Z_][\\w_]*)",

After:

https://github.com/taichi-ishitani/ruby-lsp/blob/d325628031b55e434525804356ccd7324131d0cf/vscode/grammars/ruby.cson.json#L2263

For second issue, I added the + quantification to the whitespace pattern within the beginning pattern of the block parameters.

Automated Tests

Manual Tests

I ran the extension and confirmed that such blocks are highlighted correctly.

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