Feature EIP-7702 docs

[akshay-ap]

Fixes https://github.com/safe-global/developer-experience/issues/313
Changes in PR:

• Add introductory section for EIP-7702
• Add problem with using existing Safe contracts with EIP-7702
• Add possible approaches for using Safe with EIP-7702
• Added diagrams

[github-actions]

Branch preview

✅ Deployed successfully in branch deployment:

https://feature_eip_7702_docs--docs.review.5afe.dev

[github-actions]

Overall readability score: 30.86 (🔴 -0.49)

File	Readability
7702-safe.mdx	58.67 (-)
overview.mdx	57.46 (-)

View detailed metrics

🟢 - Shows an increase in readability
🔴 - Shows a decrease in readability

File	Readability	FRE	GF	ARI	CLI	DCRS
7702-safe.mdx	58.67	44.64	10.11	12.7	12.29	6.93
	-	-	-	-	-	-
overview.mdx	57.46	48.7	10.06	11	12.11	8.39
	-	-	-	-	-	-

Averages:

	Readability	FRE	GF	ARI	CLI	DCRS
Average	30.86	26.87	13.64	17.75	15.81	8.96
	🔴 -0.49	🔴 -0.46	🟢 +0.06	🔴 -0.33	🔴 -0.06	🟢 +0.02

View metric targets

Metric	Range	Ideal score
Flesch Reading Ease	100 (very easy read) to 0 (extremely difficult read)	60
Gunning Fog	6 (very easy read) to 17 (extremely difficult read)	8 or less
Auto. Read. Index	6 (very easy read) to 14 (extremely difficult read)	8 or less
Coleman Liau Index	6 (very easy read) to 17 (extremely difficult read)	8 or less
Dale-Chall Readability	4.9 (very easy read) to 9.9 (extremely difficult read)	6.9 or less

[germartinez]

I updated the style of the diagrams. Can we use this version instead?