refactor(theme)!: decouple tokyonight options

[kylo252]

Description

(refactor!) decouple tokyonight options

moves lvim.builtin.theme.options into lvim.builtin.theme.tokyonight.options since they are
specific to how tokyonight is configured.

(refactor) better deprecation handling

• all the deprecated options are now in a single file
• use __newindex to handle new entries
• this gives us much better flexibility (e.g. this can handle lvim.builtin.theme.options.dummy)
• and it allows us to generate a trace where that action was last defined

misc

• chore: remove merge duplicate

related #3313, #3378

How Has This Been Tested?

-- add this somewhere in your config
lvim.builtin.theme.options.dim_inactive = true

[LostNeophyte]

lvim.builtin.dashboard.abc = 1 does work,
but lvim.builtin.dashboard.abc.def = 1 does not
We could use automagic tables to handle it
They allow this:

a = AutomagicTable()
a.b.c.d = "a.b and a.b.c are automatically created"

and lvim.lsp.popup_border.abc = 1 says that abc is deprecated and not popup_border

[kylo252]

We could use automagic tables to handle it

@LostNeophyte, this seems quite useful.

Let's iterate on that in a separate PR, in case there are some (performance) gotchas involved.