feat(pickers): add an option to resume and select the entry

[delphinus]

Description

This introduces a feature to select and open an entry immediately after opening :Telescope resume. This will be used this situation below.

For example, consider this situation below.

1. :Telescope find_files
2. open the file: /path/to/cwd/foo-01.txt
3. :Telescope resume
4. move the cursor with <C-n> (move_selection_next) to select the file: /path/to/cwd/foo-02.txt
5. open it with <CR> (select_default)

I want to do :Telescope resume and <C-n> and <CR> with one key mapping. With this PR, I can do that.

1. :Telescope find_files
2. open the file: /path/to/cwd/foo-01.txt
3. :Telescope resume select_pos=1

This will open the next entry: /path/to/cwd/foo-02.txt.

Fixes #3391

FYI: I borrowed this idea from Shougo's products: unite.vim, denite.nvim, and ddc.vim.

• Shougo/unite.vim has similar features: :UniteNext/:UnitePrev.
• Shougo/denite.nvim has also: doc.
• Shougo/ddu-ui-ff has also: doc.

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Added test case in lua/tests/automated/pickers/resume_spec.lua. This does tests below.

• Open :Telecsope find_files, input .md, select and open with <CR>, and it shows README.md.
• Do :Telescope resume select_pos=1, then it shows developers.md.
• Do :Telescope resume select_pos=1, then it shows CONTRIBUTING.md.
• Do :Telescope resume select_pos=-1, then it shows developers.md .
• Do :Telescope resume select_pos=-1, then it shows README.md .
• Do :Telescope resume select_pos=2, then it shows CONTRIBUTING.md.

Configuration:

• Neovim version (nvim --version): NVIM v0.11.0-dev-4602+g9d114b7205-Homebrew
• Operating system and version: macOS Sequoia 15.1.1

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)