Issue:
refactor: raise appropriate errors instead of `ValidateError`

## Type of Change
Refactoring

## Description
<!-- Describe your changes in detail -->
To describe briefly, this PR raises appropriate errors instead of `ValidateError` and removes `ValidateError` in favor of `ValidationError`. A better understanding of the changes involved in this PR can be obtained from the commit log.

<details>
<summary>Commit Log (click to expand):</summary>
<ul>
<li>fix(connectors): raise <code>ParsingError</code> or <code>ConnectorError</code> during transformations</li>
<li>feat(errors): introduce <code>PreconditionFailed</code> variant for <code>ApiErrorResponse</code></li>
<li>refactor(stripe errors): minor fixes</li>
<li>docs(ApiErrorResponse): document <code>InvalidDataValue</code> and <code>PreconditionFailed</code> variants</li>
<li>refactor(payments): raise <code>PreconditionFailed</code> error variant instead of <code>ValidateError</code></li>
<li>refactor(ext_traits): raise <code>ValidationError</code> instead of <code>ValidateError</code></li>
</ul>
</details>

## Motivation and Context
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Building on top of #40, this PR incrementally unblocks splitting the `router` crate's API models into a separate crate.


## How did you test it?
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N/A

## Checklist
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- [x] I formatted the code `cargo +nightly fmt`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed submitted code
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- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable
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Resolution:
<think>
PR Context:
- Title: fix(connector-template): raise `ConnectorError` instead of `ValidateError`
- Merged: 2022-12-08T14:37:40Z
- Files changed: 1 files
- Commits: 1 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates

## Description
<!-- Describe your changes in detail -->
This is an extension to #71, fixes two instances in the connector template which included the deprecated `ValidateError` type.


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue he
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(connector-template): raise `ConnectorError` instead of `ValidateError` (#94)
Files to modify:


**connector-template/transformers.rs**
  Modify existing code