refactor!: system redesign

New Features:
- Much better user interface
- Much more performant
- Users can now cycle through the table view
- Reduced bloat from project
- Split diff view in hunk preview
- Ability for users to perform existing commands across Project Diff Preview.
- VGit now recognizes git files outside of the project's working directory
- VGit will now recognize if a file has been renamed.
- New preview called `project_hunks_preview` to open a quick preview of all the hunks in your entire project which looks similar to the quickfix preview, but with the VGit `CodeComponent` baked inside it. Allowing you to quickly see all the diffs in your project in both split and unified diff views.
- Ton of quality life improvements
- Optimized diff rendering

Removed Features:
- diff base for gutter (current implementation makes the system very convoluted to use, e.g VSCode doesn't even support this)
- telescope integration (unnecessary bloat)
- Removed theming support (useless features makes makes codebase messy and complex)
- Removed layout support (too much configuration makes code harder to maintain)
- Renamed `buffer_staged_diff_preview` to `buffer_diff_staged_preview`

Closes issues:
- #120
- #119
- #100
- #79
- #145
- #155
- #154
- #135

lua/vgit/Command.lua

@@ -0,0 +1,45 @@
+local console = require('vgit.core.console')
+local Object = require('vgit.core.Object')
+
+local Command = Object:extend()
+
+function Command:new()
+  return setmetatable({}, Command)
+end
+
+function Command:execute(command, ...)
+  local vgit = require('vgit')
+  if not command then
+    return
+  end
+  local starts_with = command:sub(1, 1)
+  if
+    starts_with == '_'
+    or not vgit[command]
+    or not type(vgit[command]) == 'function'
+  then
+    console.error(string.format('Invalid VGit command %s', command))
+    return
+  end
+  return vgit[command](...)
+end
+
+function Command:list(arglead, line)
+  local vgit = require('vgit')
+  local parsed_line = #vim.split(line, '%s+')
+  local matches = {}
+  if parsed_line == 2 then
+    for name, func in pairs(vgit) do
+      if
+        not vim.startswith(name, '_')
+        and vim.startswith(name, arglead)
+        and type(func) == 'function'
+      then
+        matches[#matches + 1] = name
+      end
+    end
+  end
+  return matches
+end
+
+return Command