Multipule parameters per annotation

I'm always frustrated when...
...my parameters take up 3/4ths of my file length.

**Describe the solution you'd like**
Having lists of allowed values quickly increases line count. Other annotations, like "@secure()" result in +3 lines to a param. If single annotations could be stacked, there would be a great improvement in readability.

Before
```
@secure()
param _artifactsLocationSasToken string = ''

@secure()
param servicePrincipalClientID string = ''

@secure()
param servicePrincipalSecret string = ''
```
After
```
@secure()
param _artifactsLocationSasToken string = ''
param servicePrincipalClientID string = ''
param servicePrincipalSecret string = ''

```

Before
```
@allowed([
'S1'
'S2'
'S3'
'P1'
'P2'
'P3'
'P1V2'
'P2V2'
'P3V2'
])
param nonAISkillSku string = 'P3V2'

@allowed([
'S1'
'S2'
'S3'
'P1'
'P2'
'P3'
'P1V2'
'P2V2'
'P3V2'
])
param AISkillSku string = 'P3V2'

@allowed([
'S1'
'S2'
'S3'
'P1'
'P2'
'P3'
'P1V2'
'P2V2'
'P3V2'
])
param APIServerSku string = 'P3V2'
```

After

```
@allowed([
'S1'
'S2'
'S3'
'P1'
'P2'
'P3'
'P1V2'
'P2V2'
'P3V2'
])
param nonAISkillSku string = 'P3V2'
param AISkillSku string = 'P3V2'
param APIServerSku string = 'P3V2'
```

Start by reviewing how Bicep handles @secure and @allowed annotations alongside parameter declarations. Clarify the syntax and scope for applying one annotation to consecutive parameters, using both examples as acceptance cases. Done means the behavior is specified and validated for the shown annotation patterns.

Written by the indexing model from the issue text.