feat: append RLN proofs when posting messages in REST/RPC

[richard-ramos]

Description

If RLN is enabled, proofs will be appended automatically to the messages sent while using the REST or RPC servers.

Changes

• Append RLN Proofs to messages
• Validate topic subscription before posting a message
• Added some comments and fixed code climate issues for some of the files involved in this change

Issue

part of #655

[status-im-auto]

Jenkins Builds

Click to see older builds (12)

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	6f58393	#1	2023-09-07 18:06:26	~2 min	nix-flake	📄log
✔️	6f58393	#1	2023-09-07 18:06:42	~2 min	linux	📦deb
✔️	6f58393	#1	2023-09-07 18:07:09	~2 min	tests	📄log
✔️	6f58393	#1	2023-09-07 18:07:10	~2 min	tests	📄log
✔️	6f58393	#1	2023-09-07 18:08:27	~4 min	android	📦tgz
✔️	6f58393	#1	2023-09-07 18:09:46	~5 min	ios	📦tgz
✔️	b5294bd	#2	2023-09-07 18:09:42	~1 min	nix-flake	📄log
✔️	b5294bd	#2	2023-09-07 18:10:07	~2 min	linux	📦deb
✔️	b5294bd	#2	2023-09-07 18:10:40	~2 min	tests	📄log
✔️	b5294bd	#2	2023-09-07 18:10:41	~2 min	tests	📄log
✔️	b5294bd	#2	2023-09-07 18:11:33	~3 min	android	📦tgz
✔️	b5294bd	#2	2023-09-07 18:13:23	~5 min	ios	📦tgz

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	136ebcc	#3	2023-09-08 06:20:28	~2 min	nix-flake	📄log
✔️	136ebcc	#3	2023-09-08 06:20:50	~2 min	linux	📦deb
✔️	136ebcc	#3	2023-09-08 06:21:29	~3 min	tests	📄log
✔️	136ebcc	#3	2023-09-08 06:21:31	~3 min	tests	📄log
✔️	136ebcc	#3	2023-09-08 06:22:27	~4 min	android	📦tgz
✔️	136ebcc	#3	2023-09-08 06:23:34	~5 min	ios	📦tgz
✔️	1490f21	#4	2023-09-08 18:38:04	~54 sec	linux	📦deb
✔️	1490f21	#4	2023-09-08 18:38:29	~1 min	tests	📄log
✔️	1490f21	#4	2023-09-08 18:39:04	~1 min	nix-flake	📄log
✔️	1490f21	#4	2023-09-08 18:39:07	~1 min	tests	📄log
✔️	1490f21	#4	2023-09-08 18:40:58	~3 min	android	📦tgz
✔️	1490f21	#4	2023-09-08 18:41:53	~4 min	ios	📦tgz

[chaitanyaprem]

LGTM