chore: add M_Alvarez to CODEOWNERS

Doug Barrettrequested to merge
db-add-codeowners-matias into master

Context

Elliot requested that both @d.barrett and @M_Alvarez be added to CODEOWNERS so that subsequent MRs can be approved and merged without bottlenecks.

What's in this MR?

Adds @M_Alvarez to the * rule in CODEOWNERS and updates the header comment to reference GitLab CODEOWNERS documentation.

Why

Unblocks merging of approved MRs that are waiting for a code owner approval:

  • !350 (merged) refactor(v2/secret): remove deprecated NewClient constructor
  • !349 (merged) docs(v2): add top-level README with architecture overview
  • !347 (merged) docs(v2/httpserver): add README
  • !348 (merged) docs(v2): add Example_ functions for pkg.go.dev discoverability

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