feat: abstract signer on txbuilder

[crisog]

This will allow people to use their own signer implementation to build transactions, if ever needed.

[height]

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[github-actions]

Size Change: -35 B (0%)

Total Size: 35.5 kB

Filename	Size	Change
packages/signer/dist/index.js	1.83 kB	-19 B (-1%)
packages/signer/dist/index.umd.js	2 kB	-16 B (-1%)

ℹ️ View Unchanged

Filename	Size
packages/abstract-provider/dist/index.js	1.47 kB
packages/abstract-provider/dist/index.umd.js	1.56 kB
packages/isomorphic-provider/dist/index.js	2.7 kB
packages/isomorphic-provider/dist/index.umd.js	2.84 kB
packages/pocket/dist/index.js	145 B
packages/pocket/dist/index.umd.js	236 B
packages/provider/dist/index.js	2.7 kB
packages/provider/dist/index.umd.js	2.83 kB
packages/relayer/dist/index.js	2.99 kB
packages/relayer/dist/index.umd.js	3.15 kB
packages/transaction-builder/dist/index.js	4.59 kB
packages/transaction-builder/dist/index.umd.js	4.83 kB
packages/types/dist/index.js	357 B
packages/types/dist/index.umd.js	454 B
packages/utils/dist/index.js	339 B
packages/utils/dist/index.umd.js	496 B

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