chore: enforce access modifiers

[danisharora099]

This PR adds the @typescript-eslint/explicit-member-accessibility rule in eslint to enforce access modifiers

[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
Waku node	183.75 KB (+0.02% 🔺)	3.7 s (+0.02% 🔺)	28.7 s (+8.29% 🔺)	32.4 s
Waku Simple Light Node	183.84 KB (-0.04% 🔽)	3.7 s (-0.04% 🔽)	25 s (-19.55% 🔽)	28.7 s
ECIES encryption	23.12 KB (0%)	463 ms (0%)	8.2 s (+35.41% 🔺)	8.6 s
Symmetric encryption	22.58 KB (0%)	452 ms (0%)	3.3 s (-74.29% 🔽)	3.8 s
DNS discovery	72.49 KB (0%)	1.5 s (0%)	13.2 s (+8.26% 🔺)	14.7 s
Peer Exchange discovery	74.15 KB (0%)	1.5 s (0%)	10.7 s (-20.2% 🔽)	12.2 s
Local Peer Cache Discovery	67.68 KB (0%)	1.4 s (0%)	15.4 s (+9.9% 🔺)	16.7 s
Privacy preserving protocols	38.87 KB (0%)	778 ms (0%)	10.8 s (+0.27% 🔺)	11.6 s
Waku Filter	113.38 KB (+0.07% 🔺)	2.3 s (+0.07% 🔺)	18.1 s (-3.14% 🔽)	20.4 s
Waku LightPush	111.3 KB (0%)	2.3 s (0%)	28.5 s (+51.73% 🔺)	30.7 s
History retrieval protocols	111.78 KB (0%)	2.3 s (0%)	21 s (+38.13% 🔺)	23.2 s
Deterministic Message Hashing	7.29 KB (0%)	146 ms (0%)	2.2 s (+12.02% 🔺)	2.3 s