fix(subscription-map): uniform operations and encapsulation

[harsh-98]

Description

Refactor before adding getMessage to filter rest module. Related to #746.

Changes

• Don't expose items from subscriptionMap.
• In filter unsubscribe/unsubscribeAll, return list of err instead of chan. Reason: length of channel not known.
• maintain a map of pub/contentTopic to number of subscription. This way we can check if there is atleast one subscription for given pair of pubsub/contentTopic. add handle updation of this map on deleteion/creation of subscription. Note: new contentTopics can be added/removed from subscription.

Tests

• All tests passing.

[status-im-auto]

Jenkins Builds

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❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✖️	d35cb06	#1	2023-10-31 18:36:30	~1 min	tests	📄log
✖️	d35cb06	#1	2023-10-31 18:36:30	~1 min	tests	📄log
✔️	d35cb06	#1	2023-10-31 18:36:48	~1 min	nix-flake	📄log
✔️	d35cb06	#1	2023-10-31 18:37:11	~2 min	linux	📦deb
✔️	d35cb06	#1	2023-10-31 18:39:54	~5 min	android	📦tgz
✔️	d35cb06	#1	2023-10-31 18:39:59	~5 min	ios	📦tgz
✔️	b012a53	#2	2023-10-31 18:41:41	~1 min	linux	📦deb
✔️	b012a53	#2	2023-10-31 18:42:32	~2 min	nix-flake	📄log
✔️	b012a53	#2	2023-10-31 18:42:54	~2 min	tests	📄log
✔️	b012a53	#2	2023-10-31 18:43:07	~2 min	tests	📄log
✔️	b012a53	#2	2023-10-31 18:43:52	~3 min	ios	📦tgz
✔️	b012a53	#2	2023-10-31 18:43:57	~3 min	android	📦tgz
✔️	0fe7eac	#3	2023-11-01 14:03:27	~1 min	nix-flake	📄log
✔️	0fe7eac	#3	2023-11-01 14:03:56	~2 min	linux	📦deb
✔️	0fe7eac	#3	2023-11-01 14:04:50	~3 min	tests	📄log
✔️	0fe7eac	#3	2023-11-01 14:05:25	~3 min	ios	📦tgz
✔️	0fe7eac	#3	2023-11-01 14:05:29	~3 min	tests	📄log
✔️	0fe7eac	#3	2023-11-01 14:05:57	~4 min	android	📦tgz
✔️	3f0253f	#4	2023-11-03 13:00:28	~2 min	nix-flake	📄log
✔️	3f0253f	#4	2023-11-03 13:00:33	~2 min	tests	📄log
✔️	3f0253f	#4	2023-11-03 13:00:54	~2 min	linux	📦deb
✔️	3f0253f	#4	2023-11-03 13:01:35	~3 min	android	📦tgz
✔️	3f0253f	#4	2023-11-03 13:01:56	~3 min	ios	📦tgz
✔️	3f0253f	#4	2023-11-03 13:02:17	~4 min	tests	📄log

❔	Commit	#️⃣	Finished (UTC)	Duration	Platform	Result
✔️	ada9c5c	#5	2023-11-03 14:02:07	~3 min	ios	📦tgz
✔️	ada9c5c	#5	2023-11-03 14:03:13	~4 min	tests	📄log
✔️	ada9c5c	#5	2023-11-03 14:03:19	~4 min	nix-flake	📄log
✔️	ada9c5c	#5	2023-11-03 14:03:43	~5 min	linux	📦deb
✔️	ada9c5c	#5	2023-11-03 14:04:48	~6 min	android	📦tgz
✔️	ada9c5c	#5	2023-11-03 14:05:53	~7 min	tests	📄log
✔️	99d7144	#6	2023-11-04 07:12:30	~1 min	linux	📦deb
✔️	99d7144	#6	2023-11-04 07:13:14	~1 min	nix-flake	📄log
✔️	99d7144	#6	2023-11-04 07:13:47	~2 min	tests	📄log
✔️	99d7144	#6	2023-11-04 07:14:41	~3 min	ios	📦tgz
✔️	99d7144	#6	2023-11-04 07:14:49	~3 min	android	📦tgz
✔️	99d7144	#6	2023-11-04 07:15:03	~3 min	tests	📄log