[v3] Enforce stricter typing for generated bindings

[fbbdev]

Description

This PR enforces stricter typing for code output by the new binding generator.

It should fix typechecking problems with TS templates.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

By running unit tests and testing some TS templates manually.

• Windows
• macOS
• Linux

Test Configuration

# System
┌──────────────────────────────────────────────────────────┐
| Name          | MacOS                                    |
| Version       | 12.6.6                                   |
| ID            | 21G646                                   |
| Branding      | Monterey                                 |
| Platform      | darwin                                   |
| Architecture  | amd64                                    |
| Apple Silicon | unknown                                  |
| CPU           | Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz |
| CPU           | Unknown                                  |
| GPU           | Unknown                                  |
| Memory        | Unknown                                  |
└──────────────────────────────────────────────────────────┘

# Build Environment
┌─────────────────────────────────────────────────────────┐
| Wails CLI    | v3.0.0-alpha.4                           |
| Go Version   | go1.22.3                                 |
| Revision     | 02d9bfe0b3e9362863a638429dc5f2242f627fa5 |
| Modified     | false                                    |
| -buildmode   | exe                                      |
| -compiler    | gc                                       |
| CGO_CFLAGS   |                                          |
| CGO_CPPFLAGS |                                          |
| CGO_CXXFLAGS |                                          |
| CGO_ENABLED  | 1                                        |
| CGO_LDFLAGS  |                                          |
| GOAMD64      | v1                                       |
| GOARCH       | amd64                                    |
| GOOS         | darwin                                   |
| vcs          | git                                      |
| vcs.modified | false                                    |
| vcs.revision | 02d9bfe0b3e9362863a638429dc5f2242f627fa5 |
| vcs.time     | 2024-05-08T19:47:46Z                     |
└─────────────────────────────────────────────────────────┘

# Dependencies
┌───────────────────────────┐
| *NSIS           | v3.09   |
| Xcode cli tools | 2395    |
| npm             | 10.5.0  |
└─ * - Optional Dependency ─┘

Checklist:

• I have updated website/src/pages/changelog.mdx with details of this PR
• My code follows the general coding style of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes