Queues: convert to Python library (#2274)

Closes #2186 and the test harness part of #2191.

More specifically, this PR does the following:
- set up separate directories for our package, data file generation, and
tests
- move each queue's python generator and associated main component to
different files: main components are in `test/`
- remove PCQs from `data_gen/gen_queue_data_expect.sh` (for now)
- tweak runt stanzas to work with new file structure
- tweak github actions to install `queues` for CI and run
`gen_queue_data_expect.sh`
- gitignore large `.data` and `.expect` files
- fill in README for our library
- update links in the docs to our new file locations and add install
instructions

.github/workflows/rust.yml

@@ -161,14 +161,21 @@ jobs:
         git checkout -f $GITHUB_SHA
         git clean -fd
 
-    - name: Install calyx-py & MrXL
+    - name: Install calyx-py, MrXL, and queues
       working-directory: /home/calyx
       run: |
         cd calyx-py
         FLIT_ROOT_INSTALL=1 flit install --symlink
         cd -
         cd frontends/mrxl
         FLIT_ROOT_INSTALL=1 flit install --symlink
+        cd -
+        cd frontends/queues
+        FLIT_ROOT_INSTALL=1 flit install --symlink
+
+    - name: Generate queue .data and .expect files
+      working-directory: /home/calyx
+      run: ./frontends/queues/test_data_gen/gen_test_data.sh
 
     - name: Build
       uses: actions-rs/cargo@v1

.gitignore

@@ -61,5 +61,9 @@ tools/profiler/logs
 
 temp/
 
+# large queue .data and .expect files ignore
+frontends/queues/tests/**/*.data
+frontends/queues/tests/**/*.expect
+
 # for running a venv
-.venv
+.venv