Migrate from Swagger v2 to OpenAPI v3

[nscuro]

Description

• Migrates from Swagger Core v1.x (OpenAPI 2.0) to Swagger Core v2.x (OpenAPI 3.0)
• Adds declaration for multiple securitySchemes (API key and Bearer), where the previous solution only supported one (API key)
• Removes reliance on Alpine to provide a Swagger servlet, instead use a dedicated JAX-RS resource for it

BREAKING CHANGES:

• Support for OpenAPI 2.0 is dropped
• OpenAPI spec is now exposed via /api/openapi.json and /api/openapi.yaml - /api/swagger.json no longer works

Addressed Issue

Relates to #840

Additional Details

Depends on https://github.com/stevespringett/Alpine/pull/567

Checklist

• [x] I have read and understand the contributing guidelines
• ~This PR fixes a defect, and I have provided tests to verify that the fix is effective~
• ~This PR implements an enhancement, and I have provided tests to verify that it works as intended~
• ~This PR introduces changes to the database model, and I have added corresponding update logic~
• [ ] This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.01% (target: -1.00%)	:x: 0.00% (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (c04d4dff37ee6676f63bd7b557ee19885a6037d2) | 21640 | 16390 | 75.74% | | | Head commit (0c7a7ffa3ea051d81da028cb4bc92e8a3361440e) | 21642 (+2) | 16390 (+0) | 75.73% (**-0.01%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3726) | 2 | 0 | **0.00%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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