feat(composition): update all examples, make input configurable

[haarchri]

Description of your changes

• update all examples
• make all fields configurable
• update makefile

Fixes #

I have:

• Read and followed Upbound's contribution process.
• Run make reviewable to ensure this PR is ready for review.
• Added backport release-x.y labels to auto-backport this PR, as appropriate.

How has this code been tested

make render
Rendering examples/xr-cidrhost.yaml...
---
apiVersion: platform.upbound.io/v1alpha1
kind: XCIDR
metadata:
  name: cidr-host
status:
  atFunction:
    cidr:
      hostAddress: 10.0.0.111
  conditions:
  - lastTransitionTime: "2024-01-01T00:00:00Z"
    reason: Available
    status: "True"
    type: Ready
Rendering examples/xr-cidrnetmask.yaml...
---
apiVersion: platform.upbound.io/v1alpha1
kind: XCIDR
metadata:
  name: cidr-netmask
status:
  atFunction:
    cidr:
      netmask: 255.240.0.0
  conditions:
  - lastTransitionTime: "2024-01-01T00:00:00Z"
    reason: Available
    status: "True"
    type: Ready
Rendering examples/xr-cidrsubnet.yaml...
---
apiVersion: platform.upbound.io/v1alpha1
kind: XCIDR
metadata:
  name: cidr-subnet
status:
  atFunction:
    cidr:
      subnet-a: 10.0.0.0/28
  conditions:
  - lastTransitionTime: "2024-01-01T00:00:00Z"
    reason: Available
    status: "True"
    type: Ready
Rendering examples/xr-cidrsubnetloop.yaml...
---
apiVersion: platform.upbound.io/v1alpha1
kind: XCIDR
metadata:
  name: cidr-subnetloop
status:
  atFunction:
    cidr:
      subnets:
      - 10.0.0.48/32
      - 10.0.0.49/32
      - 10.0.0.50/32
  conditions:
  - lastTransitionTime: "2024-01-01T00:00:00Z"
    reason: Available
    status: "True"
    type: Ready
Rendering examples/xr-cidrsubnets.yaml...
---
apiVersion: platform.upbound.io/v1alpha1
kind: XCIDR
metadata:
  name: cidr-subnets
status:
  atFunction:
    cidr:
      subnets:
      - 10.0.0.0/28
      - 10.0.1.0/24
      - 10.0.4.0/22
  conditions:
  - lastTransitionTime: "2024-01-01T00:00:00Z"
    reason: Available
    status: "True"
    type: Ready

[humoflife]

/test-examples

[haarchri]

@humoflife think no uptest implemented in this repo - it's a custom CI and makefile

[humoflife]

LGTM