support "like=<geobox>" in virtual products

[uchchwhash]

Reason for this pull request

This is to address Issue #1276. Sincere apologies for not doing this earlier.

Proposed changes

• Recognize the possibility that the user may have already provide a preferred geobox in the like setting

  • [X] Closes #1276
  • [X] Tests added / passed
  • [X] Fully documented, including docs/about/whats_new.rst for all changes

---

:books: Documentation preview :books:: https://datacube-core--1497.org.readthedocs.build/en/1497/

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (f45ba8c) 91.79% compared to head (29bd819) 91.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1497 +/- ## =========================================== - Coverage 91.79% 91.78% -0.01% =========================================== Files 132 132 Lines 14537 14539 +2 =========================================== + Hits 13344 13345 +1 - Misses 1193 1194 +1 ``` | [Files](https://app.codecov.io/gh/opendatacube/datacube-core/pull/1497?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opendatacube) | Coverage Δ | | |---|---|---| | [datacube/virtual/impl.py](https://app.codecov.io/gh/opendatacube/datacube-core/pull/1497?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opendatacube#diff-ZGF0YWN1YmUvdmlydHVhbC9pbXBsLnB5) | `84.29% <66.66%> (-0.16%)` | :arrow_down: |

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