Filtering of synchronized secrets on collection, organization, and/or folder (#12)

* Filtering feature, minor logic changes
+: Add IP validation (to properly log IP even when trusted proxy is missing)
+: Added synchronization of decrypted organization, collection, and folder names (for filtering purposes)
+: Changed sync behavior to prevent collapsing multiple logins with the same name
+: Added possibility to filter logins based on organization, collection, and folder name/id in GetSecret
+: Added support for space character in secret name validation (it is also properly URL-decoded)

* Update README

* Fixes related to issues reported by CodeRabbit:
+: Changed british use of organisations in README
+: Reduced line count in parseSecretFilters by including helper function for filter dimensions resolution
+: Added comment clarifying absence of existence checking on dimension IDs as opposed to names
+: Removed efensive comma split logic on IPs (redundant due to IPValidation setting on Fiber)
+: Changed Query validator to align with name validator (mainly removing hard-coded values)
+: Added comments to decryptVaultLabel for clarity
+: Change empty SyncNameMaps instance with emptySyncNameMaps helper for consistency
+: Add lexical sort for lookupIDByName for deterministic result in case of multiple matches

* Bumped logging to warn and added entity metadata in log

* Unit tests:
+: Added unit tests for every newly introduced or changed function
+: Rewrote NewClient constructor to accept optional preloaded data (so it can be used in test scenarios)

* Changes requested by CodeRabbit

internal/validators/validators.go

@@ -8,7 +8,7 @@ import (
 
 const SecretNameMaxLength = 255
 
-var SecretNamePattern = regexp.MustCompile(`^[a-zA-Z0-9][a-zA-Z0-9_\-\./]*[a-zA-Z0-9]$`)
+var SecretNamePattern = regexp.MustCompile(`^[a-zA-Z0-9]([a-zA-Z0-9 _\-\./]*[a-zA-Z0-9])?$`)
 
 func IsValidSecretName(name string) bool {
 	if len(name) == 0 || len(name) > SecretNameMaxLength {
@@ -43,4 +43,17 @@ func SanitizeSecretName(name string) (string, bool) {
 	}
 
 	return "", false
-}
+}
+
+func IsValidFilterQueryValue(s string) bool {
+	s = strings.TrimSpace(s)
+	if s == "" || len(s) > SecretNameMaxLength {
+		return false
+	}
+	for _, r := range s {
+		if r < 32 || r == 127 {
+			return false
+		}
+	}
+	return true
+}