Make batch affect both memos and effects

[lukechu10]

Also simplifies effects by simply making them into memos that have a value of ().

Follow-up to #626
Supersedes #601

[github-actions]

Benchmark Report

• wasm-bindgen: the performance goal
• baseline: performance of sycamore-baseline (typically latest master)
• update: performance of sycamore (typically recent changes)
• diff: measures the improvement of update over the baseline

@@                           Performance Diff                           @@

##                          | wasm-bindgen | baseline |  update |  diff ##
##########################################################################
  01_run1k                  |        11.30 |    22.21 |   22.00 |   -0.97%
  02_replace1k              |        18.72 |    38.56 |   38.04 |   -1.35%
+ 03_update10th1k_x16       |        10.28 |    16.12 |   11.86 |  -26.42%
  04_select1k               |         1.90 |    31.47 |   30.53 |   -2.99%
+ 05_swap1k                 |         0.78 |     2.55 |    2.43 |   -4.98%
+ 06_remove-one-1k          |         0.81 |     3.18 |    2.68 |  -15.87%
  07_create10k              |       112.91 |   270.80 |  275.39 |   +1.70%
  08_create1k-after1k_x2    |        21.43 |    49.09 |   49.83 |   +1.51%
- 09_clear1k_x8             |        61.85 |    69.92 |   76.33 |   +9.18%
  21_ready-memory           |         1.71 |     1.75 |    1.75 |   -0.02%
  22_run-memory             |         2.96 |     4.91 |    4.85 |   -1.31%
  23_update5-memory         |         2.93 |     5.02 |    4.96 |   -1.24%
+ 25_run-clear-memory       |         1.81 |     3.66 |    3.54 |   -3.42%
  26_run-10k-memory         |        14.90 |    41.81 |   41.18 |   -1.50%
- 31_startup-ci             |      1964.75 |  1914.44 | 2269.83 |  +18.56%
- 32_startup-bt             |        24.15 |    35.69 |   71.14 |  +99.36%
  33_startup-mainthreadcost |       318.23 |   380.62 |  381.69 |   +0.28%
  34_startup-totalbytes     |       185.58 |   300.35 |  299.27 |   -0.36%

Workflow: 6433913291
Adding new commits will generate a new report