feature: backup seed component

[jackson-dean]

Adds functionality for backing up sensitive data: seed, passphrase, seedhex. This can be permanently disabled to make things more secure.

[jackson-dean]

Current dependencies on/for this PR:

• main
  • PR #262
  • PR #263
    • PR #264
    • PR #274
    • PR #266
      • PR #272
      • PR #268
      • PR #269 👈
        • PR #270
        • PR #273
          • PR #277
          • PR #279
        • PR #271
      • PR #267
    • PR #265

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