v0.28: `/search` name changes

[guimachiavelli]

v0.28 renames a lot of properties and parameters for the /search endpoints:

Request changes

• matches request parameter to showMatchesPosition
• facetsDistribution request parameter to facets

Response changes

• _matchesInfo response parameter to _matchesPosition
• nbHits response parameter to estimatedTotalHits
• facetsDistribution response parameter to facetDistribution
• Remove exhaustiveNbHits
• Remove exhaustiveFacetsCount

References

Spec: meilisearch/specifications#135
Issue on core: meilisearch/meilisearch#2376
SME: @gmourier