Fixes#11177
Use per-search Oniguruma match params (retry_limit_in_search) in
StringMap-backed link detection to avoid pathological backtracking hangs
on very long lines.
The units are ticks in the internal loop so its kind of opaque but
this seems to still match some very long URLs. The test case in question
was a 169K character line (which is now rejected).
Found by Valgrind:
```
==265734== 320 bytes in 8 blocks are definitely lost in loss record 13,786 of 15,141
==265734== at 0x5A65810: malloc (in /nix/store/l431jn8ahj09g5c1arrl7q6wcxngg21q-valgrind-3.24.0/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==265734== by 0x3D799EB: onig_region_resize (.cache/zig/p/N-V-__8AAHjwMQDBXnLq3Q2QhaivE0kE2aD138vtX2Bq1g7c/src/regexec.c:923)
==265734== by 0x3D81BCA: onig_region_resize_clear (.cache/zig/p/N-V-__8AAHjwMQDBXnLq3Q2QhaivE0kE2aD138vtX2Bq1g7c/src/regexec.c:949)
==265734== by 0x3DA814F: search_in_range (.cache/zig/p/N-V-__8AAHjwMQDBXnLq3Q2QhaivE0kE2aD138vtX2Bq1g7c/src/regexec.c:5454)
==265734== by 0x3DA7F25: onig_search (.cache/zig/p/N-V-__8AAHjwMQDBXnLq3Q2QhaivE0kE2aD138vtX2Bq1g7c/src/regexec.c:5414)
==265734== by 0x382E7E8: regex.Regex.searchAdvanced (regex.zig:61)
==265734== by 0x382E974: regex.Regex.search (regex.zig:48)
==265734== by 0x382EC08: terminal.StringMap.SearchIterator.next (StringMap.zig:40)
==265734== by 0x39ADDCD: renderer.link.Set.matchSetFromLinks (link.zig:320)
==265734== by 0x39AE5C7: renderer.link.Set.matchSet (link.zig:95)
==265734== by 0x39BCCE1: renderer.generic.Renderer(renderer.OpenGL).rebuildCells (generic.zig:2307)
==265734== by 0x39C3BDB: renderer.generic.Renderer(renderer.OpenGL).updateFrame (generic.zig:1228)
==265734== by 0x3993E88: renderer.Thread.renderCallback (Thread.zig:607)
==265734== by 0x3993CFF: renderer.Thread.wakeupCallback (Thread.zig:524)
==265734== by 0x39C522E: callback (async.zig:679)
==265734== by 0x39C522E: watcher.async.AsyncEventFd(api.Xev(.io_uring,backend.io_uring)).waitPoll__anon_592685__struct_596870.callback (async.zig:181)
==265734== by 0x3970EAE: backend.io_uring.Completion.invoke (io_uring.zig:804)
==265734== by 0x3973AD8: backend.io_uring.Loop.tick___anon_586861 (io_uring.zig:193)
==265734== by 0x3973BCD: backend.io_uring.Loop.run (io_uring.zig:84)
==265734== by 0x3978673: dynamic.Xev(&.{ .io_uring, .epoll }[0..2]).Loop.run (dynamic.zig:172)
==265734== by 0x3978972: renderer.Thread.threadMain_ (Thread.zig:263)
==265734== by 0x3954580: renderer.Thread.threadMain (Thread.zig:202)
==265734== by 0x39279CA: Thread.callFn__anon_573552 (Thread.zig:488)
==265734== by 0x38F4594: Thread.PosixThreadImpl.spawn__anon_570448.Instance.entryFn (Thread.zig:757)
==265734== by 0x6E567EA: start_thread (pthread_create.c:448)
==265734== by 0x6ED9FB3: clone (clone.S:100)
==265734==
```
