filer store: add foundationdb (#7178)

* add foundationdb

* Update foundationdb_store.go

* fix

* apply the patch

* avoid panic on error

* address comments

* remove extra data

* address comments

* adds more debug messages

* fix range listing

* delete with prefix range; list with right start key

* fix docker files

* use the more idiomatic FoundationDB KeySelectors

* address comments

* proper errors

* fix API versions

* more efficient

* recursive deletion

* clean up

* clean up

* pagination, one transaction for deletion

* error checking

* Use fdb.Strinc() to compute the lexicographically next string and create a proper range

* fix docker

* Update README.md

* delete in batches

* delete in batches

* fix build

* add foundationdb build

* Updated FoundationDB Version

* Fixed glibc/musl Incompatibility (Alpine → Debian)

* Update container_foundationdb_version.yml

* build SeaweedFS

* build tag

* address comments

* separate transaction

* address comments

* fix build

* empty vs no data

* fixes

* add go test

* Install FoundationDB client libraries

* nil compare

test/foundationdb/filer.toml

@@ -0,0 +1,19 @@
+# FoundationDB Filer Configuration
+
+[foundationdb]
+enabled = true
+cluster_file = "/var/fdb/config/fdb.cluster"
+api_version = 740
+timeout = "5s"
+max_retry_delay = "1s"
+directory_prefix = "seaweedfs"
+
+# For testing different configurations
+[foundationdb.test]
+enabled = false
+cluster_file = "/var/fdb/config/fdb.cluster"
+api_version = 740
+timeout = "10s"
+max_retry_delay = "2s"
+directory_prefix = "seaweedfs_test"
+location = "/test"