Add id validation to initialization process (#5)

[nekrassov01]

Implemented id validation to initialization process using regular expressions.

Invoke-PasmInitialize.ps1

# Pattern match validation 'VpcId' and 'AssociationSubnetId'
if ($PSBoundParameters.ContainsKey('VpcId')) {
    if ($vpcId -cnotmatch '^vpc-[0-9a-z]{17}$') {
        throw [InvalidOperationException]::new($('''{0}'' does not match a valid id pattern.' -f $vpcId))
    }
}
if ($PSBoundParameters.ContainsKey('SubnetId')) {
    foreach ($id in $SubnetId) {
        if ($id -cnotmatch '^subnet-[0-9a-z]{17}$') {
            throw [InvalidOperationException]::new($('''{0}'' does not match a valid id pattern.' -f $id))
        }
    }
}

Caution

This is only a validation using regular expressions and does not guarantee that the ID actually exists.