refactor: add index route to JSON example

[ElijahAhianyo]

Description

Currently, the json example only has the /swagger route, so the / route doesnt work. It's nice to have a root route that just redirects to the /swagger route. This PR does exactly that.

As a bonus, it adds a view name to the index route of the internal SwaggerUI app so downstream users can reverse_redirect to it

Type of change

• Bug fix
• New feature
• Documentation
• Refactor / cleanup
• Performance improvement
• Other (describe above)

[github-actions]

Bencher Report

Branch	elijah/json-example-route
Testbed	github-ubuntu-latest

Click to view all benchmark results

Benchmark	Latency	Benchmark Result microseconds (µs) (Result Δ%)	Upper Boundary microseconds (µs) (Limit %)
empty_router/empty_router	📈 view plot 🚷 view threshold	5,681.30 µs (-6.64%) Baseline: 6,085.39 µs	7,606.56 µs (74.69%)
json_api/json_api	📈 view plot 🚷 view threshold	1,015.60 µs (-5.07%) Baseline: 1,069.85 µs	1,305.48 µs (77.79%)
nested_routers/nested_routers	📈 view plot 🚷 view threshold	980.88 µs (-0.59%) Baseline: 986.72 µs	1,189.50 µs (82.46%)
single_root_route/single_root_route	📈 view plot 🚷 view threshold	948.17 µs (-0.10%) Baseline: 949.16 µs	1,153.43 µs (82.20%)
single_root_route_burst/single_root_route_burst	📈 view plot 🚷 view threshold	16,654.00 µs (-5.76%) Baseline: 17,672.83 µs	21,318.54 µs (78.12%)

🐰 View full continuous benchmarking report in Bencher

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cot/src/openapi/swagger_ui.rs	0.00%	1 Missing ⚠️

Flag	Coverage Δ
rust	90.08% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cot/src/openapi/swagger_ui.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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