Highlight number, string and boolean placeholders differently

[EmilyGraceSeville7cf]

Expected behavior

Highlight integer/floating point number placeholders, string and boolean ones differently: add option to config to specify what color is required for such placeholder kind.

Actual behavior

All placeholders are highlighted in one color.

Log, debug output

Put any log or error output here.

Environment

• Operating system - macOS/Linux/Windows (add version if needed)
• Node.js version (node --version)
• tldr-node-client version (tldr --version)