features: added file for what is new in v5.8.x

docs/features/new-in-5.8.x.md

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+# Kamailio SIP Server - New Features in 5.8.x Version
+
+📘 **Previous version was 5.8.x (released on May 2023), see
+what was new in that release at**:
+
+  -  [New In v5.7.x](new-in-5.7.x.md)
+
+📘 *This is a draft of new features added in this version,
+manually updated, thus not always synchronized with what is new in
+source code repository.*
+
+## New Modules
+
+## New in existing Modules
+
+### permissions
+
+  - RPC reload limit controlled via **reload_delta** module parameter
+
+### registrar
+
+## New in Core
+
+### Command line arguments
+
+### Interpreter
+
+### Parameters
+
+### Functions
+
+### Memory Managers
+
+  - alignment to 16 bytes for `q_malloc (qm)` and `f_malloc (fm)`
+
+### Architecture
+
+### kamailio.cfg
+
+## Tools
+
+### kamcmd
+
+### kamctl
+
+### kamdbctl
+
+### kamcli