feat: add PostgreSQL typed parameter support

[rodri-oliveira-dev]

Summary

Adds a provider-specific PostgreSQL package for Dapper typed parameters using Npgsql. The new provider keeps PostgreSQL metadata explicit at the call site through NpgsqlDbType, while preserving the existing SQL Server package contract.

What changed

• New TypedParameters.Dapper.PostgreSql package.
• PostgreSQL TypedPostgresParameter core parameter implementation.
• PostgresParam factories for scalar values.
• JSON support through distinct json and jsonb factories.
• Temporal support for date, time, timestamp, timestamptz, and interval.
• Native PostgreSQL array support with explicit element types.
• Unit and Testcontainers integration tests for PostgreSQL.
• CI validation for both providers and both target frameworks.
• Release workflow updates for independent multi-provider packages.
• Public docs, provider guide, and changelog updates.

Architecture

SQL Server and PostgreSQL remain provider-specific packages because their database contracts and ADO.NET provider APIs are meaningfully different. The branch intentionally avoids a shared TypedDbParameter abstraction so SQL Server features such as output parameters and TVPs do not leak into PostgreSQL, and PostgreSQL features such as arrays, JSON, and timestamp semantics stay explicit.

Validation

• dotnet --info
• dotnet restore Dapper.TypedParameters.sln
• dotnet build Dapper.TypedParameters.sln --configuration Release --no-restore
• SQL Server unit tests: net8.0, net10.0
• PostgreSQL unit tests: net8.0, net10.0
• SQL Server integration tests: net8.0, net10.0
• PostgreSQL integration tests: net8.0, net10.0
• dotnet pack for both provider packages
• RunPackageValidation for both provider packages
• package contents validation for both provider packages
• package consumption validation for both provider packages on net8.0 and net10.0
• dependency vulnerability audit with dotnet list package --vulnerable --include-transitive

Packages

• TypedParameters.Dapper.SqlServer
• TypedParameters.Dapper.PostgreSql

Release pipeline

The release workflow now validates, packs, and publishes the two provider packages separately. Each package keeps its own NuGet identity and package validation path, and the workflow produces independent .nupkg and .snupkg artifacts before publication.

Closes #8

[chatgpt-codex-connector]

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