Format baseFeePerGas to number in returned blocks - Closes #4326

[spacesailor24]

Closes #4326

As mentioned previously, this is technically a breaking change

[render]

Your Render PR Server URL is https://web3-js-pr-4330.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c517mv1t9ds1hpirptl0.

[jdevcs]

lgtm, also doc update this

[philknows]

This will be a breaking change. Will need to disseminate information out via community channels before merging.

[jdevcs]

also update BlockHeader as mentioned by this

[coveralls]

Pull Request Test Coverage Report for Build 1263611492

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 261 unchanged lines in 8 files lost coverage.
• Overall coverage increased (+2.4%) to 74.942%

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Files with Coverage Reduction	New Missed Lines	%
packages/web3-core-requestmanager/src/jsonrpc.js	1	70.0%
packages/web3-core-helpers/src/formatters.js	6	84.87%
packages/web3-core-helpers/lib/formatters.js	10	81.23%
packages/web3-core-helpers/src/errors.js	29	1.56%
packages/web3-utils/src/utils.js	31	8.46%
packages/web3-utils/src/soliditySha3.js	34	3.43%
packages/web3-utils/src/index.js	43	31.38%
packages/web3-eth-accounts/src/index.js	107	23.67%

Totals
Change from base Build 1262887513:	2.4%
Covered Lines:	3219
Relevant Lines:	4060

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💛 - Coveralls