Add FUNCTION FLUSH command to flush all functions (#9936)

Added `FUNCTION FLUSH` command. The new sub-command allows delete all the functions.
An optional `[SYNC|ASYNC]` argument can be given to control whether or not to flush the
functions synchronously or asynchronously. if not given the default flush mode is chosen by
`lazyfree-lazy-user-flush` configuration values.

Add the missing `functions.tcl` test to the list of tests that are executed in test_helper.tcl,
and call FUNCTION FLUSH in between servers in external mode

1 files changed, 1 insertions, 0 deletions

diff --git a/src/functions.h b/src/functions.h
index 4a1ec4a24..66147f97c 100644
--- a/src/functions.h
+++ b/src/functions.h
@@ -105,6 +105,7 @@ unsigned long functionsMemoryOverhead();
 int functionsLoad(rio *rdb, int ver);
 unsigned long functionsNum();
 dict* functionsGet();
+size_t functionsLen(functionsCtx *functions_ctx);
 functionsCtx* functionsCtxGetCurrent();
 functionsCtx* functionsCtxCreate();
 void functionsCtxFree(functionsCtx *functions_ctx);