Txn: Refactor some stateless checks on transactions

[jannotti]

Summary

Some cleanups I ran into while doing tx.Access. Wanted to make this PR first because that PR risks being big anyway.

transaction.WellFormed() was huge. Move each transaction's implementation into the file that defined the transaction type's field.

transaction.Alive() is better thought of as a method on block. It's the block that decides if the transaction is Alive. By moving it there, we remove an interface that was only introduced to fix the circular dependency caused by putting in the "wrong" place.

transaction.MatchAddress is rewritten to avoid accumulating a slice of addresses just to call slice.Contains on it.

AddressTxns is now TxnsFrom since its callers (stateproof REST endpoints) really only wanted to inspect the Sender anyway. They wanted the transactions sent by a particular address, not any transaction related to that address.

We should consider making MatchAddress work properly for additional types like acfg and freeze, but it's only used to decide what transactions to return from pending when an address filter is given.

Made some changes to how we turn evaldeltas into consumable json. The pending endpoint and the dry-run code were both doing, in slightly different ways. I'll need to modify it for tx.Access, so I wanted to clean it up now.

Test Plan

No meaningful tests should have been removed, only moved, hopefully to more meaningful places. The biggest motion was creating /transaction/<txType>_test.go in cases where it didn't exist, to hold the associated WellFormedness checks.

(By accident of history, payment_test was doing some general transaction tests, because that was basically the only transaction at one time.)

[codecov]

Codecov Report

Attention: Patch coverage is 71.72131% with 69 lines in your changes missing coverage. Please review.

Project coverage is 51.72%. Comparing base (55011f9) to head (7aa72cb).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
data/transactions/transaction.go	35.13%	24 Missing ⚠️
data/transactions/application.go	69.49%	10 Missing and 8 partials ⚠️
data/bookkeeping/block.go	50.00%	10 Missing and 3 partials ⚠️
daemon/algod/api/server/v2/handlers.go	0.00%	8 Missing ⚠️
data/ledger.go	0.00%	4 Missing ⚠️
daemon/algod/api/server/v2/utils.go	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6287      +/-   ##
==========================================
+ Coverage   51.70%   51.72%   +0.02%     
==========================================
  Files         647      649       +2     
  Lines       86874    86849      -25     
==========================================
+ Hits        44917    44922       +5     
+ Misses      39100    39058      -42     
- Partials     2857     2869      +12     

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[algorandskiy]

In general looks good, not sure about getting rid First/Last getters