Apply chunking of assets before indicator calculation

[goergen95]

This PR applies pre-chunking to assets. While adding overhead before indicator calculation begins, parallelization is more efficient because we now know in advance over how many items to iterate. This also means that we can get rid of the nested future topology, which is anyways really hard to reason about.

More specifically, chunking applies the following steps to all assets in a portfolio:

• split assets within +/- 5 degrees of the dateline
• split multipolygons into their components if their bbox area is larger than the chunk_size
• split polygons with bbox larger than chunk_size into a grid with cellsize equal to chunk_size
• each sub-part of an asset receives the same assetid, indicator results are then aggregated later based on its value

mapme.biodiversity/R/chunking.R

Lines 1 to 12 in 4318724

	.chunk <- function(x, chunk_size) {
	stopifnot(inherits(x, "sf") && "assetid" %in% names(x))
	metadata <- st_drop_geometry(x)
	x <- x[, "assetid"]
	x[["chunked"]] <- FALSE
	st_geometry(x) <- "geometry"
	x <- .split_dateline(x)
	x <- .split_multipolygons(x, chunk_size)
	x <- .chunk_geoms(x, chunk_size)
	.finalize_assets(x, metadata)
	}

[codecov]

Codecov Report

Attention: Patch coverage is 89.43089% with 13 lines in your changes missing coverage. Please review.

Project coverage is 86.06%. Comparing base (1ac0d9a) to head (6b93d4b).

Files	Patch %	Lines
R/chunking.R	89.71%	11 Missing ⚠️
R/calc_indicators.R	87.50%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #322      +/-   ##
==========================================
+ Coverage   85.68%   86.06%   +0.38%     
==========================================
  Files          52       53       +1     
  Lines        2319     2361      +42     
==========================================
+ Hits         1987     2032      +45     
+ Misses        332      329       -3     

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