Problem: vim.lsp.buf.hover allows a bold border size which hasn't been
defined

Solution: Define the bold border size for vim.lsp.buf.hover

Problem:
55e4301036bb938474fc9768c41e28df867d9286 changed the program name but not the function name.

Solution:
Fix the healthcheck.

It's not used anywhere.

`stripped` and `markdown_lines` are iterated together so must have the same length.

Avoids some table allocations.
In a quick test over 50000 iterations it reduces the time from 130ms to
74 ms

For the test setup details see:

https://github.com/mfussenegger/nvim-dap/pull/1394#issue-2725352391

- No redundant `:gsub` to turn `-` in `Content-Length` into `_`
- No table allocations only to add and later get the content-length
  header

Problem:
Some language servers do not work properly without a workspace folder.

Solution:
Add `workspace_required`, which skips starting the lsp client if no
workspace folder is found.

Co-authored-by: Justin M. Keyes <justinkz@gmail.com>

Problem:
Nvim needlessly requests inlay_hints even if they are disabled for a given buffer.

Solution:
Add the missing `enabled` check in `on_refresh`.
Rest of the code has this check already so that's the only needed one to fix this.

Problem
When calling `:checkhealth vim.lsp` after the user has enabled a language
server with `vim.lsp.enable` that has no configuration a runtime error
is hit because the code expects for a configuration to exist.

Solution:
Check if a configuration was returned before parsing it, if it isn't
returned then warn the user that the server has been enabled but a
configuration was not found.