Support BuildProperties/BuildMethod config for multiple functions

### Describe your idea/feature/enhancement

Hey folks, super pumped about the new typescript + esbuild feature. One annoying thing I noticed is that for every function resource, I have to specify a metadata field with the esbuild options. You can imagine how repetitive this can get with multiple functions.

e.g.

```yaml
Metadata: # Manage esbuild properties
BuildMethod: esbuild
BuildProperties:
Minify: true
Target: 'es2020'
Sourcemap: true
EntryPoints:
- index.ts
```

### Proposal

Would be awesome if we could somehow add this to the `Globals` section of the sam template. e.g If I wanted to use esbuild for all my functions.

The same would be great to have for LayerVersion.