Skip over godebug lines in go.mod/go.work files

Go 1.21 introduced support for godebug lines in go.mod and go.work
files. Skip over these lines instead of failing

Related bazel-contrib#1945

internal/bzlmod/go_mod.bzl

@@ -80,6 +80,8 @@ def parse_go_work(content, go_work_label):
                 state["use"].append(tokens[0])
             elif current_directive == "replace":
                 _parse_replace_directive(state, tokens, go_work_label.name, line_no)
+            elif current_directive == "godebug":
+                pass
             else:
                 fail("{}:{}: unexpected directive '{}'".format(go_work_label.name, line_no, current_directive))
         elif tokens[0] == "go":
@@ -101,6 +103,9 @@ def parse_go_work(content, go_work_label):
                 state["use"].append(tokens[1])
         elif tokens[0] == "toolchain":
             continue
+        elif tokens[0] == "godebug":
+            if tokens[1] == "(":
+                current_directive = tokens[0]
         else:
             fail("{}:{}: unexpected directive '{}'".format(go_work_label.name, line_no, tokens[0]))
 
@@ -210,7 +215,7 @@ def parse_go_mod(content, path):
             continue
 
         if not current_directive:
-            if tokens[0] not in ["module", "go", "require", "replace", "exclude", "retract", "toolchain"]:
+            if tokens[0] not in ["module", "go", "require", "replace", "exclude", "retract", "toolchain", "godebug"]:
                 fail("{}:{}: unexpected token '{}' at start of line".format(path, line_no, tokens[0]))
             if len(tokens) == 1:
                 fail("{}:{}: expected another token after '{}'".format(path, line_no, tokens[0]))

tests/bzlmod/go_mod_test.bzl

@@ -57,6 +57,13 @@ _GO_MOD_21_CONTENT = """go 1.21.0rc1
 module example.com
 
 toolchain go1.22.2
+
+godebug (
+    default=go1.21
+    panicnil=1
+    asynctimerchan=0
+)
+godebug tlsrsakex=1
 """
 
 _EXPECTED_GO_MOD_21_PARSE_RESULT = struct(
@@ -114,6 +121,13 @@ use (
 replace github.com/go-fsnotify/fsnotify => github.com/fsnotify/fsnotify v1.4.2
 replace github.com/bmatcuk/doublestar/v4 v4.0.2 => github.com/bmatcuk/doublestar/v4 v4.0.3
 replace example.org/hello => ../fixtures/hello
+
+godebug (
+    default=go1.21
+    panicnil=1
+    asynctimerchan=0
+)
+godebug tlsrsakex=1
 """
 
 _EXPECTED_GO_WORK_PARSE_RESULT = struct(