refactor: use vim.system instead of pleanry (#85)

* refactor!: migrate to vim.system

* refactor(gotests): use vim.system

* refactor(iferr): use vim.system

* refactor(impl): use vim.system

* refactor(installer): use vim.system and add sync mode

* test: fix gotests' tests

* refactor(struct_tags): use vim.system

* chore(ci): install all deps explicitly

* refactor(installer)!: add sync as an option

* docs: update readme

.github/workflows/tests.yml

@@ -47,7 +47,12 @@ jobs:
           key: ${{ runner.os }}-tests-${{ hashFiles('${{ github.workspace }}/.tests') }}
 
       - name: Install Go bins
-        run: nvim --headless -u "./scripts/minimal_init.lua" -c "GoInstallDeps" -c "qa!"
+        run: |
+          # TODO: install with :GoInstallDeps
+          go install github.com/fatih/gomodifytags@latest
+          go install github.com/josharian/impl@latest
+          go install github.com/cweill/gotests/...@latest
+          go install github.com/koron/iferr@latest
 
       - name: Run Tests
         run: |