feat: HTTP Signatureのフィルターを追加

src/main/kotlin/dev/usbharu/hideout/service/signature/HttpSignatureFilter.kt

@@ -0,0 +1,12 @@
+package dev.usbharu.hideout.service.signature
+
+import jakarta.servlet.Filter
+import jakarta.servlet.FilterChain
+import jakarta.servlet.ServletRequest
+import jakarta.servlet.ServletResponse
+
+class HttpSignatureFilter : Filter {
+    override fun doFilter(request: ServletRequest, response: ServletResponse, chain: FilterChain) {
+        chain.doFilter(request, response)
+    }
+}