search: allowing search param key to be modified

[0einstein0]

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Description

Related to zenodo/zenodo-rdm#890

Makes the searchParamKey configurable to make it more accurate, previously it was set to suggest, which did not work well for certain endpoints e.g. api/awards

https://127.0.0.1:5000/api/awards?q=micro - returns 10 records containing the word micro in title
whereas, https://127.0.0.1:5000/api/awards?suggest=micro - returns 0 records
this would cause problems when users are searching for relevant results

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[0einstein0]

Closed as we will introduce a separate component in the future that doesn't use the suggestion api.