feat: add useProperSingularization option for model name singularization

[ballistic-booger]

• add rule-based Singularize to StringExtensions (policies -> Policy, statuses -> Status, devices -> Device)
• thread new opt-in flag through ToModelName callers in DataClassesGen, ModelsGen, CommonGen, DbDriver, EnumDbDriver
• expose useProperSingularization in RawOptions/Options, default false to keep legacy TrimEnd('s') behavior
• add ModelNameTests covering both legacy and proper singularization paths
• document the option in README and docs/03_Usage.md
• regenerate example request.json/request.message fixtures with the new option field

[github-actions]

Release Assistant - Action Required

Version-worthy changes detected in:

• CodeGenerator/
• Drivers/
• Extensions/
• PluginOptions/

Add one of the following labels to this PR: major, minor, patch.

• patch — Bug fixes, documentation updates
• minor — New features, backwards-compatible
• major — Breaking changes, API modifications

This PR cannot be merged until a version label is added.

[ballistic-booger]

Not sure what the release-assistant/requirements failure is referring to, when I open it up it looks like it passed.

[doron050]

Not sure what the release-assistant/requirements failure is referring to, when I open it up it looks like it passed.

It refers to this #440 (comment)

I added it so the release process will be easier

Tldr - add a label to the PR that represents your change type and this will be calculated into the next release version

[ballistic-booger]

Not sure what the release-assistant/requirements failure is referring to, when I open it up it looks like it passed.

It refers to this #440 (comment)

I added it so the release process will be easier

Tldr - add a label to the PR that represents your change type and this will be calculated into the next release version

Thanks for clarifying. I tried to add the label, but it seems like I don't have the permissions to do so. Neither the UI or gh let's me.

❯ gh pr edit 440 --repo DaredevilOSS/sqlc-gen-csharp --add-label minor
GraphQL: ballistic-booger does not have the correct permissions to execute AddLabelsToLabelable (addLabelsToLabelable)