fix: add methods to fetch builtIn and builtInWrite tools

[jguoamz]

Problem

• LS is now hardcoding the list of tool names which is error prone when we update it
  • fix: add missing tools from the list language-servers#1756

Solution

• Add support to fetch the list of tool names

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.