feat: expose withdrawal credentials of ethereum validators

[drohit-cb]

What changed? Why?

This PR helps expose withdrawal credentials of ethereum validators in preparation of Pectra. Using this customers can tell if their validator is a 0x01 or a 0x02 validator.

testing

Example local run

2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0x971d618c9d38c9a189c9b5d2514e1b2f7191992ff3ad14f766a331685b11ef19734d1cdcac65349f44caa218bfa4a85e, active
2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0xb25c46bdbd8e9ac5afdee4e454f6ce57a0e5a26b705a280b600e2aa8a4c238fcc3522798ce6b49cfd45ed80007aefe0c, active
2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0xa1abe4d3b8557c1ec0076591549f14fefc27d313c9dc44f7da4232a41156b84c92fff0403c68fdaf95a1ef23d1511e3a, active
2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0xaf8abb7eb2cfd2c34280016cff4005b6c4159807da8cf1fad1921c84b220af5fa9cfd43bdaf470fe4384c79d37a09eed, active
2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0x85cec05d59b45f53b5e30137bd2cc39a68c9a3eda6a814307df7d00719d130e227ab00e535836937c53747a9f6881982, active
2025/02/27 11:22:14 0x010000000000000000000000db816889f2a7362ef242e5a717dfd5b38ae849fe 0xdb816889f2a7362ef242e5a717dfd5b38ae849fe, 0xa5d9c1d1d7b601cfb1e62970260bc37c1a19534867b84f9539f783dfd94971880f180819432c52648f68e5c9df29ea85, active

Qualified Impact

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1