feat: Expose route tables info (#138)

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### Motivation


Allow downstream module can obtain route tables info

### Modifications

- Expose route tables info
- Add type tag on route tables resources

### Verifying this change

- [x] Make sure that the change passes the CI checks.

*(Please pick either of the following options)*

This change is a trivial rework / code cleanup without any test
coverage.

*(or)*

This change is already covered by existing tests, such as *(please
describe tests)*.

*(or)*

This change added tests and can be verified as follows:

*(example:)*
- *Added integration tests for end-to-end deployment with large payloads
(10MB)*
  - *Extended integration test for recovery after broker failure*

### Documentation

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- [x] `no-need-doc` 
  
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modules/vpc/main.tf

@@ -96,7 +96,7 @@ resource "aws_route_table" "public_route_table" {
   count = 1
 
   vpc_id = aws_vpc.vpc.id
-  tags   = merge({ "Vendor" = "StreamNative", Name = format("%s-public-rtb", var.vpc_name) }, var.tags)
+  tags   = merge({ "Vendor" = "StreamNative", "Type" = "public", Name = format("%s-public-rtb", var.vpc_name) }, var.tags)
 
   lifecycle {
     ignore_changes = [tags]
@@ -122,7 +122,7 @@ resource "aws_route_table" "private_route_table" {
   count = var.disable_nat_gateway ? 0 : local.num_azs
 
   vpc_id = aws_vpc.vpc.id
-  tags   = merge({ "Vendor" = "StreamNative", Name = format("%s-private-rtb-%s", var.vpc_name, count.index) }, var.tags)
+  tags   = merge({ "Vendor" = "StreamNative", "Type" = "private", Name = format("%s-private-rtb-%s", var.vpc_name, count.index) }, var.tags)
 
   lifecycle {
     ignore_changes = [tags]

modules/vpc/outputs.tf

@@ -22,6 +22,14 @@ output "public_subnet_ids" {
   description = "A list of public subnet ID's created by this module"
 }
 
+output "private_route_table_ids" {
+  value = aws_route_table.private_route_table.*.id
+}
+
+output "public_route_table_ids" {
+  value = aws_route_table.public_route_table.*.id
+}
+
 output "vpc_id" {
   value       = aws_vpc.vpc.id
   description = "The ID of the VPC created by this module"