GetVariantsMatch service

[magento-engcom-team]

Depends on #357

Steps

• implement GetVariantsMatch request for VariantSearchService in proto:

message OptionSelectionRequest
{
  string store = 1;
  repeated string values = 2;
}

message ProductVariantResponse {
  repeated ProductVariant matched_variants = 3;
}

service VariantService {
  rpc GetVariantsMatch (OptionSelectionRequest) returns (ProductVariantResponse);
}

• see https://github.com/magento/catalog-storefront/blob/develop/dev/docs/designDocuments/Configurable-products-option-variants.md for general details
• see https://github.com/magento/catalog-storefront/blob/develop/dev/docs/designDocuments/Product-Variants-services.md for details about services
• cover with API-functional tests

[magento-engcom-team]

The issue was exported from the internal JIRA. The link to the original JIRA issue: https://jira.corp.magento.com/browse/SFAPP-84

[m2-assistant]

Hi @magento-engcom-team. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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[bricht]

@magento I am working on this