refactor: decouple mongodb driver from root module

[fredbi]

• fixes Consider removing mongo-db-driver dependency #91
• relates to Update mongo-driver to v2 to resolve CVE-2024-45337 (crypto v0.26.0 vulnerability) #191

Drop go.mongodb.org/mongo-driver/v2 from the root go.mod by introducing an internal minimal BSON codec (bsonlite) that is wire-compatible with mongo-driver v2.5.0. Users who want the real driver can opt in with a blank import: import _ "github.com/go-openapi/strfmt/enable/mongodb".

• internal/bsonlite: minimal BSON encoder/decoder for string, DateTime, ObjectID document types (no external dependencies)
• enable/mongodb: separate Go module that replaces the lite codec with the real mongo-driver via init()
• ObjectId type changed from bsonprim.ObjectID to [12]byte (same underlying type, backward compatible)
• All BSON marshal/unmarshal methods rewritten to use bsonlite.C interface
• Convert to mono-repo: go.work, CI workflows switched to monorepo variants (ci-workflows v0.2.13), dependabot scans all modules
• Integration tests verify both codec paths against real MongoDB

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 67.53623% with 112 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.30%. Comparing base (7304ce1) to head (21159c0).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
mongo.go	69.18%	16 Missing and 37 partials ⚠️
internal/bsonlite/lite.go	76.85%	16 Missing and 9 partials ⚠️
enable/mongodb/mongodb.go	0.00%	22 Missing ⚠️
bson.go	65.51%	5 Missing and 5 partials ⚠️
internal/bsonlite/codec.go	85.71%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
- Coverage   85.01%   83.30%   -1.72%     
==========================================
  Files          14       17       +3     
  Lines        2016     2150     +134     
==========================================
+ Hits         1714     1791      +77     
- Misses        218      257      +39     
- Partials       84      102      +18     

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