fix: SignalHandler not exported in mobile package

[richard-ramos]

Description

During the library refactor, the mobile package ended up missing the SignalHandler. This PR adds it back to the correct folder

Issue

closes #790

[status-im-auto]

Jenkins Builds

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❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	e942694	#1	2023-10-03 23:45:42	~2 min	nix-flake	📄log
✔️	e942694	#1	2023-10-03 23:46:08	~2 min	linux	📦deb
✔️	e942694	#1	2023-10-03 23:46:28	~2 min	tests	📄log
✔️	e942694	#1	2023-10-03 23:47:32	~4 min	android	📦tgz
✔️	e942694	#1	2023-10-03 23:47:59	~4 min	tests	📄log
✔️	e942694	#1	2023-10-03 23:48:02	~4 min	ios	📦tgz

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	6170130	#2	2023-10-07 20:21:36	~1 min	tests	📄log
✔️	6170130	#2	2023-10-07 20:21:56	~1 min	nix-flake	📄log
✔️	6170130	#3	2023-10-07 20:22:12	~13 sec	nix-flake	📄log
✔️	6170130	#2	2023-10-07 20:22:13	~2 min	tests	📄log
✔️	6170130	#3	2023-10-07 20:22:26	~46 sec	tests	📄log
✔️	6170130	#2	2023-10-07 20:22:29	~2 min	linux	📦deb
✔️	6170130	#3	2023-10-07 20:23:27	~53 sec	linux	📦deb
✔️	6170130	#2	2023-10-07 20:25:21	~5 min	ios	📦tgz
✔️	6170130	#3	2023-10-07 20:25:22	~5 min	ios	📦tgz
✔️	6170130	#3	2023-10-07 20:25:26	~3 min	tests	📄log
✔️	6170130	#3	2023-10-07 20:27:19	~3 min	android	📦tgz
✔️	7c8bc3a	#2	2023-10-07 20:24:06	~4 min	android	📦tgz

[chaitanyaprem]

LGTM