[MM-20979] Add first implementation of the Bleve search engine (#14562)

* [MM-20979] Add first implementation of the Bleve search engine

* Fix i18n

* Migrate searchengine utils tests

* Fix linter

* Don't add allTermsQ if both termQueries and notTermQueries are empty

* Fix test that should work if user is system admin

* Modify naming according to review comments

* Abstract getIndexDir function

* Extracting bleve engine name as a constant

* Merge both Indexer interfaces into one

* Add worker stopped message

* Allow worker to be started/stopped with config change

* Use constants for index names

* Modify test order

* Fix linter

* Trying to unlock the CI

store/searchtest/user_layer.go

@@ -20,12 +20,12 @@ var searchUserStoreTests = []searchTest{
 	{
 		Name: "Should honor channel restrictions when autocompleting users",
 		Fn:   testHonorChannelRestrictionsAutocompletingUsers,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should honor team restrictions when autocompleting users",
 		Fn:   testHonorTeamRestrictionsAutocompletingUsers,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name:        "Should return nothing if the user can't access the channels of a given search",
@@ -69,17 +69,17 @@ var searchUserStoreTests = []searchTest{
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by Dot",
 		Fn:   testAutocompleteUserByUsernameWithDot,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by underscore",
 		Fn:   testAutocompleteUserByUsernameWithUnderscore,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should be able to autocomplete a user by part of its username splitted by hyphen",
 		Fn:   testAutocompleteUserByUsernameWithHyphen,
-		Tags: []string{ENGINE_ELASTICSEARCH},
+		Tags: []string{ENGINE_ELASTICSEARCH, ENGINE_BLEVE},
 	},
 	{
 		Name: "Should escape the percentage character",