Initial setup (#1)

Initial implementation of `interval_join`, `groupby_interval_join` and `quantile_windows`.

.github/workflows/CI.yml

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+name: CI
+on:
+  push:
+    branches:
+    tags: '*'
+  pull_request:
+concurrency:
+  # Skip intermediate builds: always.
+  # Cancel intermediate builds: only if it is a pull request build.
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.6'
+          - '1'
+          - 'nightly'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: julia-actions/cache@v1
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v2
+        with:
+          files: lcov.info

.github/workflows/CompatHelper.yml

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+name: CompatHelper
+on:
+  schedule:
+    - cron: 0 0 * * *
+  workflow_dispatch:
+jobs:
+  CompatHelper:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Pkg.add("CompatHelper")
+        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
+      - name: CompatHelper.main()
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COMPATHELPER_PRIV: ${{ secrets.DOCUMENTER_KEY }}
+        run: julia -e 'using CompatHelper; CompatHelper.main()'

.github/workflows/TagBot.yml

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+name: TagBot
+on:
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
+jobs:
+  TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'beacon-buddy'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          registry: beacon-biosignals/BeaconRegistry
+          registry_ssh: ${{ secrets.BEACON_REGISTRY_RO_SSH_KEY }}

.github/workflows/style.yml

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+name: Style-Enforcer
+on:
+  push:
+    branches:
+      - 'main'
+    tags: '*'
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+    # note: keep in sync with `format/run.jl`
+    paths-ignore:
+      - 'README.md'
+      - '.gitignore'
+jobs:
+  format-check:
+    name: Style Enforcement (Julia ${{ matrix.julia-version }} - ${{ github.event_name }})
+    # Run on push's or non-draft PRs
+    if: (github.event_name == 'push') || (github.event.pull_request.draft == false)
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        julia-version: [1.7]
+    steps:
+      - uses: julia-actions/setup-julia@latest
+        with:
+          version: ${{ matrix.julia-version }}
+      - uses: actions/checkout@v1
+      - name: Instantiate `format` environment and format
+        run: |
+          julia --project=format -e 'using Pkg; Pkg.instantiate()'
+          julia --project=format 'format/run.jl'
+      - uses: reviewdog/action-suggester@v1
+        if: github.event_name == 'pull_request'
+        with:
+          tool_name: JuliaFormatter
+          fail_on_error: true