feat(prometheus): Add remote write questions (#11555)

**Description**
Add the ability to enable remote write endpoints for sending Prometheus
data to external services. See the [remoteWrite spec] for details on the
format.

[remoteWrite
spec](https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/api.md#remotewritespec)

⚒️ Fixes  # <!--(issue)-->

**⚙️ Type of change**

- [x] ⚙️ Feature/App addition
- [ ] 🪛 Bugfix
- [ ] ⚠️ Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 🔃 Refactor of current code

**🧪 How Has This Been Tested?**
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Please describe the tests that you ran to verify your changes. Provide
instructions so we can reproduce. Please also list any relevant details
for your test configuration
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**📃 Notes:**
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**✔️ Checklist:**

- [ ] ⚖️ My code follows the style guidelines of this project
- [ ] 👀 I have performed a self-review of my own code
- [ ] #️⃣ I have commented my code, particularly in hard-to-understand
areas
- [ ] 📄 I have made corresponding changes to the documentation
- [ ] ⚠️ My changes generate no new warnings
- [ ] 🧪 I have added tests to this description that prove my fix is
effective or that my feature works
- [x] ⬆️ I increased versions for any altered app according to semantic
versioning

**➕ App addition**

If this PR is an app addition please make sure you have done the
following.

- [ ] 🪞 I have opened a PR on
[truecharts/containers](https://github.com/truecharts/containers) adding
the container to TrueCharts mirror repo.
- [ ] 🖼️ I have added an icon in the Chart's root directory called
`icon.png`

---

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Signed-off-by: SuperQ <superq@gmail.com>

charts/enterprise/prometheus/Chart.yaml

@@ -29,7 +29,7 @@ sources:
   - https://github.com/prometheus-community/helm-charts
   - https://github.com/prometheus-operator/kube-prometheus
 type: application
-version: 12.0.0
+version: 12.1.0
 annotations:
   truecharts.org/catagories: |
     - metrics

charts/enterprise/prometheus/questions.yaml

@@ -80,6 +80,44 @@ questions:
                 schema:
                   type: boolean
                   default: false
+              - variable: remoteWrite
+                label: "Remote Write"
+                schema:
+                  type: list
+                  default: []
+                  items:
+                    - variable: remoteWriteEntry
+                      label: Remote Write Entry
+                      schema:
+                        additional_attrs: true
+                        type: dict
+                        attrs:
+                          - variable: url
+                            label: URL
+                            description: Remote write destination URL
+                            schema:
+                              type: string
+                              required: true
+                              default: ""
+                          - variable: basicAuth
+                            label: Basic Auth
+                            type: dict
+                            description: Basic authentication for remote write
+                            attrs:
+                              - variable: username
+                                label: Username
+                                description: Basic auth username
+                                schema:
+                                  type: string
+                                  required: true
+                                  default: ""
+                              - variable: password
+                                label: Password
+                                description: Basic auth password
+                                schema:
+                                  type: string
+                                  required: false
+                                  default: ""
 
   - variable: exporters
     group: "App Configuration"