Add toJSON() method for BAL

[holgerd77]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.54%. Comparing base (d9bc56d) to head (d84d96f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	87.78% <ø> (ø)
blockchain	88.85% <ø> (ø)
common	93.44% <ø> (ø)
evm	61.90% <ø> (ø)
mpt	89.65% <ø> (+0.25%)	⬆️
statemanager	78.10% <ø> (ø)
static	91.35% <ø> (ø)
tx	88.01% <ø> (ø)
util	80.30% <92.00%> (+1.45%)	⬆️
vm	55.93% <ø> (ø)

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[github-actions]

📦 Bundle Size Analysis

Package	Size (min+gzip)	Δ
binarytree	17.5 KB	⚪ ±0%
block	43.5 KB	⚪ ±0%
blockchain	69.6 KB	⚪ ±0%
common	25.3 KB	⚪ ±0%
devp2p	17.7 KB	⚪ ±0%
e2store	87.1 KB	⚪ ±0%
ethash	61.5 KB	⚪ ±0%
evm	61.5 KB	🔴 +0.2 KB (+0.37%)
genesis	272.1 KB	⚪ ±0%
mpt	21.9 KB	⚪ ±0%
rlp	1.7 KB	⚪ ±0%
statemanager	41.2 KB	⚪ ±0%
testdata	43.8 KB	⚪ ±0%
tx	20.7 KB	🟢 -0.0 KB (-0.03%)
util	13.0 KB	🔴 +0.2 KB (+1.57%)
vm	153.3 KB	🔴 +0.2 KB (+0.14%)
wallet	14.9 KB	⚪ ±0%

Values are minified+gzipped bundles of each package entry. Workspace deps are bundled; external deps are excluded.

_{Generated by bundle-size workflow}

[holgerd77]

Very local method addition, will take this in.