api.tree.find_file feature parity

[alex-courtis]

api.tree.find_file lacks feature parity with :NvimTreeFindFile and :NvimTreeFindFileToggle:

• bang - update root
• focus
• current buffer

Add similar options to open and toggle:

api.tree.find_file({opts})                     *nvim-tree.api.tree.find_file()*
    Find and focus a file or folder in the tree.

    Parameters: ~
    • {opts} (table) optional parameters with boolean defaults

    Options: ~
    • {path}           (string)         absolute path otherwise current buffer
    • {open}           (boolean, false) open the tree
    • {current_window} (boolean, false) open the tree in the current window
    • {update_root}    (boolean, false) see |nvim-tree.update_focused_file.update_root|
    • {focus}          (boolean, false) focus the tree

---@class ApiTreeFindFileOpts
---@field path string|nil
---@field open boolean|nil default false
---@field current_window boolean|nil default false
---@field update_root boolean|nil default false
---@field focus boolean|nil default false

Move nvim-tree.find_file into find-file.

Resolves:

• update_focused_file.enable Unnecessary Find On nvim-tree enter #2009
• Circular calls between nvim-tree.open and .find_file
• need for find_file running