feat: add a new command - deck file openapi2mcp

[harshadixit12]

This PR adds three changes -

1. New command - deck file openapi2mcp
2. openapi2kong - Fix header based routing to only consider required headers, and add a fallback (through go-apiops bump)
3. openapikong - Fix duplicate plugin IDs generated for the routes when header based routing is used

Issues resolved:
#1856
#1838

[harshadixit12]

Content taken from https://github.com/Kong/go-apiops/blob/main/cmd/openapi2mcp.go#L136

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 86 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.04%. Comparing base (d9d642e) to head (41f5bdc).

Files with missing lines	Patch %	Lines
cmd/file_openapi2mcp.go	0.00%	85 Missing ⚠️
cmd/root.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1954      +/-   ##
==========================================
- Coverage   33.51%   33.04%   -0.47%     
==========================================
  Files          76       77       +1     
  Lines        6726     6812      +86     
==========================================
- Hits         2254     2251       -3     
- Misses       4293     4381      +88     
- Partials      179      180       +1     

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