Upgrade Sonyflake to v2 (#66)

* Add v2

* Introduce staticcheck

* Introduce golangci-lint

* Add error checks

* Add error checks

* Lint v2 code

* Improve CI trigger

* Use io.ReadAll

* Use int64

* Remove NewSonyflake

* Fix errors

* v2: Change MachineID, sequence, and AmazonEC2MachineID to int; update all usage and tests for type consistency

* docs: update Settings struct in README to use int for MachineID and CheckMachineID (v2)

* docs(v2): clarify Settings, StartTime, MachineID, and CheckMachineID comments and update README links and explanations

* docs(v2/mock): improve comments and docstrings for mock implementations

* docs(types): unify and clarify package and type docstrings for types.go in v1 and v2

* test(v2): refactor and modernize tests, improve error assertions, and update mocks for v2

* test(v2): normalize whitespace in pseudoSleep calls for consistency

* feat(v2): add configurable TimeUnit and refactor time handling for So… (#67)

* feat(v2): add configurable TimeUnit and refactor time handling for Sonyflake v2

* test(v2): add ToTime tests, clarify TimeUnit behavior, and update docs for v2

* gofmt

.github/workflows/test-v2.yml

@@ -0,0 +1,50 @@
+name: CI for v2 Module
+
+on:
+  push:
+    paths:
+      - .github/workflows/test-v2.yml
+      - 'v2/**'
+  pull_request:
+    paths:
+      - .github/workflows/test-v2.yml
+      - 'v2/**'
+
+jobs:
+  test-v2:
+    strategy:
+      matrix:
+        go-version: [1.23.x, 1.24.x]
+        os: [ubuntu-latest]
+
+    runs-on: ${{matrix.os}}
+
+    defaults:
+      run:
+        working-directory: ./v2
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: ./v2/go.mod
+
+      - name: Tidy modules
+        run: go mod tidy
+
+      - name: Lint Code
+        uses: golangci/golangci-lint-action@v6
+        with:
+          working-directory: ./v2
+
+      - name: Check format
+        run: test -z "`gofmt -l .`"
+
+      - name: Run tests
+        run: go test ./... -v
+
+      - name: Build example
+        run: cd example && ./linux64_build.sh