Add eslint and prettier to code base

[cbrianball]

Cleanup issues found by linters

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	91.13%	1100 / 1207
🔵	Statements	91.13%	1100 / 1207
🔵	Functions	88.88%	72 / 81
🔵	Branches	81.49%	185 / 227

File Coverage

File	Stmts	% Branch	% Funcs	% Lines	Uncovered Lines
Changed Files
src/index.ts	100%	100%	100%	100%
src/v4.ts	100%	100%	100%	100%
src/lib/BooleanPredicateBuilder.ts	100%	42.85%	100%	100%
src/lib/ExcludeProperties.ts	0%	0%	0%	0%	1-10
src/lib/Expression.ts	100%	100%	100%	100%
src/lib/ExpressionOperator.ts	100%	100%	100%	100%
src/lib/ExpressionVisitor.ts	0%	0%	0%	0%	1-8
src/lib/FieldReference.ts	100%	100%	100%	100%
src/lib/FieldsForType.ts	0%	0%	0%	0%	1-4
src/lib/FilterAccessoryFunctions.ts	94.59%	71.42%	80%	94.59%	22-23
src/lib/JsonPrimitiveTypes.ts	0%	0%	0%	0%	1-4
src/lib/Literal.ts	100%	100%	100%	100%
src/lib/ODataContext.ts	100%	100%	100%	100%
src/lib/ODataQuery.ts	93.13%	90.32%	86.66%	93.13%	151-153, 165-168, 189-197
src/lib/ODataQueryProvider.ts	97.89%	86.95%	100%	97.89%	53, 82
src/lib/ODataResponse.ts	0%	0%	0%	0%	1-32
src/lib/ODataType.ts	100%	100%	100%	100%
src/lib/ODataV4Context.ts	100%	100%	100%	100%
src/lib/ODataV4ExpressionVisitor.ts	94.81%	82.14%	100%	94.81%	94-95, 106, 122, 153, 163, 166-167, 197, 199, 204
src/lib/ODataV4QueryProvider.ts	96%	90%	100%	96%	41-42, 49-50
src/lib/ProxyFilterTypes.ts	100%	100%	100%	100%
src/lib/ProxyPropertyPredicate.ts	96.66%	79.16%	100%	96.66%	98-99, 109-110
src/lib/ProxyTypes.ts	100%	100%	100%	100%
src/lib/SubType.ts	0%	0%	0%	0%	1-10
src/lib/TypedExpressionVisitor.ts	100%	80%	100%	100%

Generated in workflow #75