TxSummary digest (#52)

* add tx_summary_digest proposal

* fixup

* fixups

* fixups, more diagrams

* fixup

* fixup

* fixup mermaid

* restructure the reference level part

* improve text

* improve mermaid annotations

* Apply suggestions from code review

Incorporate several of @remoun's and @nick-mobilecoin's suggestions.

Co-authored-by: Remoun Metyas <[email protected]>
Co-authored-by: Nick Santana <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: isis lovecruft <[email protected]>

* rewrite guide-level explanation

* Update text/0052-tx-summary-digest.md

Co-authored-by: isis lovecruft <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: isis lovecruft <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: Nick Santana <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: isis lovecruft <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: isis lovecruft <[email protected]>

* fixups, add discussion about chain of trust

* fixup formatting

* fix typos

* fixup language

* address isis comment

* add a disclaimer

* add clarifying text

* update with discussion about inputs with rules, rearrange slightly

* update with input rules digest

* add a note about the input rules digest

* Update text/0052-tx-summary-digest.md

Co-authored-by: Eran Rundstein <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: Eran Rundstein <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: Eran Rundstein <[email protected]>

* Update text/0052-tx-summary-digest.md

Co-authored-by: Eran Rundstein <[email protected]>

* add note about signing oracle

Co-authored-by: isis lovecruft <[email protected]>
Co-authored-by: Remoun Metyas <[email protected]>
Co-authored-by: Nick Santana <[email protected]>
Co-authored-by: Eran Rundstein <[email protected]>