Skip and group features to reduce powerset size

We run out of space on the default github action runners when we naively
run `cargo hack` powerset. Attempt to reduce the size of the powerset by
skipping the default feature, and grouping related features together.

.github/workflows/feature_powerset.yml

@@ -51,8 +51,8 @@ jobs:
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@cargo-hack
       - name: Test
-        run: cargo hack test --no-fail-fast --feature-powerset --workspace
+        run: cargo hack test --no-fail-fast --feature-powerset --skip default --group-features jwt-ietf,jwt --group-features jwt-openid,jwt --workspace
       - name: Check
-        run: cargo hack check --feature-powerset --no-dev-deps --workspace
+        run: cargo hack check --feature-powerset --no-dev-deps --skip default --group-features jwt-ietf,jwt --group-features jwt-openid,jwt --workspace
       - name: Clippy
-        run: cargo hack clippy --workspace --all-targets --feature-powerset -- -D warnings
+        run: cargo hack clippy --workspace --all-targets --feature-powerset --skip default --group-features jwt-ietf,jwt --group-features jwt-openid,jwt -- -D warnings