Issue #738 - Rename continuous and discrete examples

[nikosbosse]

Description

This PR closes #738.

As discussed in #738, this PR renames

• example_continuous --> example_sample_continuous
• example_integer --> example_sample_discrete

Checklist

• [x] My PR is based on a package issue and I have explicitly linked it.
• [x] I have included the target issue or issues in the PR title as follows: issue-number: PR title
• [x] I have tested my changes locally.
• [x] I have added or updated unit tests where necessary.
• [x] I have updated the documentation if required.
• [x] I have built the package locally and run rebuilt docs using roxygen2.
• [x] My code follows the established coding standards and I have run lintr::lint_package() to check for style issues introduced by my changes.
• [ ] I have added a news item linked to this PR.
• [ ] I have reviewed CI checks for this PR and addressed them as far as I am able.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.31%. Comparing base (686f0c2) to head (74e34e8).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #775 +/- ## ======================================= Coverage 95.31% 95.31% ======================================= Files 21 21 Lines 1602 1602 ======================================= Hits 1527 1527 Misses 75 75 ```

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